Moonbow Slouchy Chunky Knit Cardigan Pattern

A Free Knitting Pattern from Mama In A Stitch

There is something undeniably satisfying about wrapping yourself in a cardigan you made with your own two hands. The weight of it, the softness, the way it drapes just right over your shoulders — it feels like accomplishment made wearable. The Moonbow Slouchy Chunky Knit Cardigan is exactly that kind of project. It is the pattern you reach for when you want something cozy, a little oversized, and completely gorgeous, without spending weeks hunched over tiny needles counting stitches by lamplight.

This pattern is beginner-friendly, works up quickly with chunky yarn, and produces a cardigan that looks like it came straight out of a boutique window. Whether you are new to knitting or a seasoned knitter looking for a satisfying weekend project, the Moonbow is the kind of cardigan that earns you compliments every single time you wear it.

Let’s walk through everything you need to know, from materials and sizing to step-by-step instructions, finishing tips, and ideas for styling your finished piece.

Why You Will Love This Pattern

Before we get into the details, let’s talk about what makes this pattern so special, because there are a lot of cardigan patterns out there and this one genuinely stands apart.

First, the construction is simple. The Moonbow Cardigan is worked flat in pieces — a back panel, two front panels, and two sleeves — then seamed together. This approach means you are never juggling a complicated round or worrying about picking up stitches in awkward places. Each piece is straightforward and satisfying on its own.

Second, the yarn does a lot of the heavy lifting. Chunky yarn means each stitch is visible and impactful. You can see your progress in real time, which is incredibly motivating. You are not knitting for hours before anything looks like anything. With chunky yarn, a few rows in and you already have something substantial in your hands.

Third, the silhouette is timeless. The slouchy fit means this cardigan works over everything — a flowy dress, a fitted tee, a chunky turtleneck sweater, leggings with boots. It is not precious or fussy. It just works, every single day, every single season.

Materials You Will Need

Gathering your materials before you start is always a good idea. There is nothing worse than casting on enthusiastically and then running out of yarn on the last sleeve. Here is what you will need for the Moonbow Slouchy Chunky Knit Cardigan.

Yarn: Approximately 800–1,200 yards of bulky or super bulky yarn, depending on your size. A soft, drapey yarn works beautifully here. Look for something with a touch of natural fiber — wool, alpaca, or a wool blend — for that lovely drape and warmth. Merino wool is a popular choice because it is soft against skin, has natural elasticity, and takes dye beautifully, which means you will find it in an incredible range of colors. If you are looking for a budget-friendly option, there are also some wonderful acrylic and acrylic blend bulky yarns that work just as well and are machine washable, which is always a practical bonus.

Needles: US size 13 (9mm) straight or circular needles. You can use circular needles even when working flat — many knitters prefer them because they can hold more stitches comfortably. Wooden or bamboo needles tend to work well with chunky yarn because they have a bit of grip that prevents stitches from sliding off accidentally.

Notions: A tapestry needle for seaming, stitch markers if you like to mark your progress, scissors, and a measuring tape. A row counter can also be helpful if you find it easy to lose your place.

Gauge: 10 stitches and 14 rows = 4 inches in stockinette stitch. Always, always swatch. It takes maybe twenty minutes and it will save you from a cardigan that fits your twelve-year-old instead of you. Even experienced knitters swatch, because gauge can vary based on your yarn, your needles, your tension, even the time of day and how relaxed you are. Swatching is not a formality — it is the difference between a cardigan that fits and one that does not.

Sizing Guide

The Moonbow Slouchy Chunky Knit Cardigan is designed to be worn with positive ease — meaning you want the finished garment to be larger than your actual measurements. This is what gives it that beautiful, relaxed, draped quality.

The pattern is written to fit a range of sizes. Finished bust measurements run from approximately 42 inches to 60 inches, accommodating sizes XS through 3XL. To determine your size, measure your actual bust and add 6 to 10 inches for the desired ease. If you like an extremely oversized fit, go up another size. This is a forgiving, flexible pattern.

For reference, here are general finished measurements for each size category. A size Small typically yields a finished bust of around 42–44 inches. A Medium finishes around 46–48 inches. A Large comes in around 50–52 inches. XL runs about 54 inches, and 2XL–3XL reaches 56–60 inches depending on the yarn weight and your gauge.

The cardigan length is designed to hit at the hip, roughly 24–26 inches from shoulder to hem, though this is easy to adjust by simply adding or subtracting rows to the body before the armhole shaping begins.

Abbreviations

Before diving into the instructions, familiarize yourself with these standard abbreviations used throughout the pattern.

CO — cast on. BO — bind off. K — knit. P — purl. St/sts — stitch/stitches. RS — right side. WS — wrong side. Rep — repeat. PM — place marker. SM — slip marker. K2tog — knit two together (a right-leaning decrease). SSK — slip, slip, knit (a left-leaning decrease). YO — yarn over. WE — work even, meaning continue in the established pattern without increases or decreases.

Pattern Instructions

Gauge Swatch

Before casting on your first piece, knit a swatch of at least 20 stitches by 20 rows in stockinette stitch. Block the swatch by wetting it and laying it flat to dry, then measure your gauge. Adjust needle size up or down as needed until your gauge matches the pattern.

The Back Panel

Cast on the appropriate number of stitches for your size. For a size Medium, cast on 54 stitches.

Row 1 (RS): Knit across.
Row 2 (WS): Purl across.

Repeat these two rows, working in stockinette stitch, until your piece measures 15 inches from the cast-on edge, or your desired body length to the underarm. End with a WS row.

Armhole Shaping: At the beginning of the next two rows, bind off 4 stitches. You will now have fewer stitches on your needle — for a Medium, approximately 46 stitches remain.

Continue in stockinette stitch, working even, until the armhole measures approximately 9 inches. End with a WS row.

Shoulder and Neck Shaping: Bind off 7 stitches at the beginning of the next two rows for the shoulders. Bind off the remaining center stitches for the back neck. For a Medium this is approximately 32 stitches for the back neck. Weave in your ends and set this piece aside.

Left Front Panel

Cast on half the number of back stitches, plus a few extra for the front band. For a Medium, cast on 30 stitches.

Row 1 (RS): Knit across.
Row 2 (WS): Purl to last 4 stitches, K4.

The 4-stitch garter edge at the front creates a simple, tidy band along the opening of the cardigan. Repeat these two rows until your piece measures 15 inches from the cast-on edge, matching your back panel length to the underarm. End with a WS row.

Armhole Shaping: At the beginning of the next RS row, bind off 4 stitches. Continue in the established pattern, working even, until the armhole measures approximately 6 inches. End with a WS row.

Neck Shaping: At the neck edge (the front band edge), bind off 5 stitches. Then decrease 1 stitch at the neck edge every RS row 3 times. Work even on the remaining shoulder stitches until the armhole matches the back panel armhole depth. Bind off remaining shoulder stitches.

Right Front Panel

Work the same as the Left Front Panel, but reverse the shaping. The garter band now appears at the opposite edge, and the armhole and neck shaping are mirrored.

Row 1 (RS): Knit across.
Row 2 (WS): K4, purl to end.

Continue as for the Left Front Panel, reversing all shaping.

Sleeves (Make Two)

Cast on 22 stitches for a Medium.

Row 1 (RS): Knit across.
Row 2 (WS): Purl across.

Increase Row (RS): K1, M1L, knit to last stitch, M1R, K1.

Work 5 rows even, then work another increase row. Continue this increase sequence — increase every 6th row — until you have 36 stitches, or approximately 18 inches from cast on for a full-length sleeve. Adjust the length here to your preference. Some knitters prefer a three-quarter sleeve, in which case you would stop a few inches earlier.

Sleeve Cap Shaping: Bind off 4 stitches at the beginning of the next two rows. Then decrease 1 stitch at each end every RS row until 10 stitches remain. Bind off all remaining stitches.

Finishing and Seaming

This is where your separate pieces come together and the cardigan truly takes shape. Block each piece before seaming. Wet blocking is ideal — submerge each piece in cool water, gently press out the excess water (never wring), and lay flat on a blocking mat or clean towel, pinning to the correct measurements. Let dry completely.

Once blocked, use your tapestry needle and a length of yarn to seam the shoulder seams first, then set in the sleeves, then seam the side seams and sleeve seams in one continuous line if possible, or separately if you prefer. Use a mattress stitch for an invisible seam on stockinette sections and whipstitch for the cast-on and bind-off edges.

Weave in all ends securely on the wrong side of the work.

If you would like to add buttons, choose three to five large buttons (at least one inch in diameter) and space them evenly along the front band. Use your tapestry needle and matching yarn to sew them in place. You can create simple yarn loops on the opposite front band as buttonholes, or leave the cardigan open — both are lovely options.

Tips for Success

Even a beginner-friendly pattern comes with a learning curve. Here are some tips that will make your experience knitting the Moonbow much smoother.

Take your time with gauge. It has been said already but it bears repeating. A chunky pattern like this one is especially sensitive to gauge changes because each stitch represents a larger area of fabric. Being even half a stitch off per inch can result in a cardigan that is several inches too large or too small by the time you finish.

Use stitch markers generously. Mark your increases, your armhole shaping points, and the center of your sleeves. The more visual cues you give yourself, the less likely you are to lose your place in the pattern.

Count your stitches at the end of every row for the first few inches, at least. Catching a dropped stitch or an accidental increase early is much easier than finding it ten rows later.

Do not rush the seaming. Seams on a knit garment are what make it look polished and professional or, conversely, lumpy and homemade in the less flattering sense. Take your time with the mattress stitch, go slowly, and match your row counts carefully.

Block everything before you seam, and again after you seam if needed. Blocking is transformative. A cardigan that looks a little uneven and rough straight off the needles can become something genuinely beautiful after a good blocking session.

Yarn Recommendations

Choosing the right yarn for this pattern makes an enormous difference. Here are some directions to explore.

For a luxurious, high-end version, look for a single-ply merino or merino-alpaca blend in a bulky weight. The drape will be exceptional and the softness unmatched. These yarns tend to come in beautiful, nuanced colorways that make the simple stockinette stitch look incredibly rich.

For an everyday, machine-washable option, look for a premium acrylic or acrylic-wool blend in a bulky weight. Brands like Lion Brand, Caron, and Big Twist offer excellent bulky yarns at very accessible price points. A machine-washable cardigan is practical for real life, especially if you plan to wear it often.

For a budget-friendly choice that still yields gorgeous results, check the clearance or sale bins at your local craft store. Bulky yarn goes on sale frequently, and the Moonbow is a wonderful pattern for using up a yarn you bought on impulse or received as a gift.

The colorway you choose will also shape the mood of your cardigan. A creamy oatmeal or soft ivory reads as classic and bohemian. A deep charcoal or slate blue is sophisticated and versatile. A bold rust, burnt orange, or deep burgundy is warm and autumnal and absolutely stunning. A heathered gray is endlessly wearable. This is a pattern worth making more than once in different colors for different seasons and moods.

Styling Your Moonbow Cardigan

Once your cardigan is finished, the real fun begins. The Moonbow is one of those pieces that works effortlessly in multiple contexts.

For a casual everyday look, pair it with straight-leg jeans, a simple white or striped tee, and ankle boots or sneakers. Let the cardigan hang open and slightly off one shoulder for that effortless, undone look.

For a cozy at-home look, throw it over pajamas or lounge pants with thick socks and a cup of something warm. This is the cardigan you will reach for on slow Sunday mornings.

For a more put-together look, layer it over a slip dress or a fitted midi dress with heeled boots. The contrast between the chunky knit and the dressier pieces underneath is chic and interesting.

For a layered fall or winter outfit, wear it over a turtleneck and under a long puffer vest. The chunky texture adds visual warmth and dimension to an otherwise simple layering combination.

A Note on Customizing This Pattern

One of the great joys of knitting your own clothes is the ability to make adjustments. The Moonbow Cardigan is particularly adaptable.

Want a longer cardigan? Add rows to the body before the armhole shaping. Want a cropped version? Stop several inches earlier. Want three-quarter length sleeves? Work your sleeve to a shorter length before the cap shaping. Want a bit of texture? Swap out the stockinette body for a simple seed stitch or a 2×2 rib for added visual interest and a slightly different drape.

You can also adjust the neckline. A deeper V neck creates a more dramatic look. A wider, more open neckline creates a relaxed boatneck feel. The pattern as written gives you a classic, moderately deep V that flatters a wide range of body types.

Sharing Your Finished Cardigan

When you finish your Moonbow Slouchy Chunky Knit Cardigan, please share it! This pattern is meant to be made, worn, loved, and shared with the community of makers who make knitting such a wonderful creative pursuit.

Tag your projects on Instagram and Ravelry. Share your color choices, your modifications, your before and after blocking photos. Knitting is deeply communal at its heart, and seeing the variety of ways different knitters interpret the same pattern is one of the most inspiring things there is.

If you have questions as you work through the pattern, leave them in the comments. The knitting community is generous and enthusiastic about helping beginners and fellow makers troubleshoot, find solutions, and celebrate their finishes.

Happy knitting. May your yarn be tangle-free, your gauge be perfect, and your finished Moonbow be exactly as cozy and beautiful as you imagined it when you cast on that very first stitch.