Free Pattern: Knit a Breezy Summer Cardigan You’ll Wear All Season Long

There is something deeply satisfying about finishing a handknit cardigan just as the warm months arrive — draping it over your shoulders for a cool evening on the porch, tossing it over a sundress for a farmers market morning, or keeping it close in an overly air-conditioned office. A summer cardigan hits that perfect sweet spot between functional and beautiful, and when you make it yourself, it becomes something genuinely irreplaceable.

This free knit summer cardigan pattern is designed to be approachable for knitters at an intermediate level, though adventurous beginners who are comfortable with basic shaping and working flat will find it manageable with a little patience. The design features a relaxed, open-front silhouette, three-quarter-length sleeves, and a lightweight drape that makes it ideal for layering in warm weather. We will walk through everything together — materials, gauge, sizing, stitch patterns, and step-by-step instructions — so that by the end, you will have everything you need to cast on and get started.

Why Knit a Summer Cardigan?

Before we dive into the pattern itself, let’s talk about why a summer cardigan deserves a place in your knitting queue. Many knitters associate cardigans with chunky wool and cozy winters, but summer knitting has its own rhythm and rewards. The yarns are lighter, the projects move quickly, and the finished pieces get worn constantly rather than sitting in a drawer for six months of the year.

A summer cardigan works over tank tops, t-shirts, and dresses. It is the garment you reach for when the afternoon breeze picks up, when a restaurant cranks the AC, or when you want a polished layer for a casual event. And because you knit it yourself, you can customize the fit, the color, and the details to suit exactly what you love.

Cotton, linen, and bamboo blends are the workhorses of summer knitting. They have breathability that wool simply cannot match in warm weather, and they tend to have a gorgeous drape that showcases simple stitch textures beautifully. This pattern is written for a cotton-linen blend, but we will talk about substitutions as well.

Materials and Yarn

Yarn: You will need approximately 800–1,200 yards of a DK weight cotton or cotton-linen blend yarn, depending on your size. The pattern is written in five sizes, and yardage varies accordingly (more on that in the sizing section). Some excellent options include Paintbox Yarns Cotton DK, Lion Brand 24/7 Cotton in DK, or Drops Safran. For a slightly more elevated drape, look for anything with a linen or bamboo component, such as Paintbox Yarns Cotton-Linen DK or BC Garn Allino.

Needles: US size 5 (3.75mm) circular needle, 32 inches or longer, for working back and forth in rows. You will also want a US size 4 (3.5mm) needle for the ribbing sections if your gauge tends to run loose, though this is optional.

Notions:
A set of stitch markers (you will need at least 6), a tapestry needle for seaming and weaving in ends, stitch holders or scrap yarn, a row counter (optional but helpful), and blocking mats and pins for finishing.

Gauge: 22 stitches and 30 rows = 4 inches in stockinette stitch after blocking. Getting gauge is genuinely important for garments, so please swatch. Cotton and linen yarns can behave quite differently from wool, and they often loosen up significantly after blocking and washing. Knit a swatch of at least 6 inches square, wash and dry it the way you plan to care for the finished cardigan, and measure before you cast on.

Sizing

This pattern is written in five sizes to fit a range of bodies. The sizes are based on finished bust measurements, and the cardigan is designed with approximately 2 inches of positive ease, meaning it will be slightly larger than your actual bust measurement for a comfortable, relaxed fit.

Size 1: Finished bust 34 inches (fits approximately 32-inch bust)
Size 2: Finished bust 38 inches (fits approximately 36-inch bust)
Size 3: Finished bust 42 inches (fits approximately 40-inch bust)
Size 4: Finished bust 46 inches (fits approximately 44-inch bust)
Size 5: Finished bust 50 inches (fits approximately 48-inch bust)

Yardage by size: Size 1 requires approximately 800 yards, Size 2 approximately 920 yards, Size 3 approximately 1,020 yards, Size 4 approximately 1,100 yards, and Size 5 approximately 1,200 yards.

Throughout the pattern, instructions will be written for Size 1 with larger sizes in parentheses in the order Size 2, Size 3, Size 4, Size 5. When only one number appears, it applies to all sizes.

Stitch Glossary

Before casting on, let’s review the abbreviations and stitches used throughout the pattern.

k — knit
p — purl
k2tog — knit two stitches together (a right-leaning decrease)
ssk — slip, slip, knit (a left-leaning decrease)
yo — yarn over
RS — right side of the work
WS — wrong side of the work
pm — place marker
sm — slip marker
CO — cast on
BO — bind off

The body of this cardigan is worked primarily in stockinette stitch. The hem, cuffs, and button bands use a 1×1 ribbing (knit 1, purl 1 alternating). There is a simple eyelet row worked along the back hem as a decorative detail, but it is entirely optional and can be omitted if you prefer a plain hem.

Pattern Notes

This cardigan is worked in pieces — a back, two fronts, and two sleeves — and then seamed together. If you prefer to avoid seaming, the construction can be adapted to work the body in the round up to the armhole, but those modifications are not covered here. The seamed construction gives the cardigan a bit more structure, which many knitters prefer in a garment worked in cotton.

The fronts are worked identically until the neckline shaping, where the left and right fronts diverge slightly. Because this is an open-front cardigan with no buttons or closures, there is no button band math to worry about — the front edges are simply finished with a few rows of ribbing for a clean look.

Read through the entire pattern before beginning. It always helps to have a sense of the big picture before you start, especially when it comes to shaping sections.

The Pattern

Back

Cast on 94 (106, 116, 128, 138) stitches using the long-tail cast on or your preferred method.

Ribbing: Work in 1×1 rib (k1, p1) for 10 rows, ending with a wrong-side row.

Optional eyelet row (RS): K2, yo, k2tog, repeat from to last 2 stitches, k2. This creates a small decorative eyelet detail at the hem. If you skip this, simply knit a RS row instead.

Next row (WS): Purl across.

Continue in stockinette stitch (knit RS rows, purl WS rows) until piece measures 13 (13.5, 14, 14, 14.5) inches from cast-on edge, ending with a WS row.

Armhole shaping:
Bind off 5 (6, 7, 8, 9) stitches at the beginning of the next two rows. You will have 84 (94, 102, 112, 120) stitches remaining.

Next row (RS): K2, ssk, knit to last 4 stitches, k2tog, k2.
Next row (WS): Purl across.

Repeat these two rows 4 (5, 6, 7, 8) more times. You will have 74 (82, 88, 96, 102) stitches remaining.

Continue in stockinette without further shaping until armhole measures 7 (7.5, 8, 8.5, 9) inches, ending with a WS row.

Shoulder and back neck shaping:
Bind off 8 (9, 10, 11, 12) stitches at the beginning of the next two rows.
Bind off 8 (9, 10, 11, 12) stitches at the beginning of the following two rows.
Bind off the remaining 42 (46, 48, 52, 54) stitches for the back neck.

Left Front

Cast on 47 (53, 58, 64, 69) stitches.

Ribbing: Work in 1×1 rib for 10 rows, ending with a WS row.

Optional eyelet row (RS): Work as for back.

Next row (WS): Purl across.

Continue in stockinette until piece measures the same as the back to the armhole, ending with a WS row.

Armhole shaping:
Bind off 5 (6, 7, 8, 9) stitches at the beginning of the next RS row. You will have 42 (47, 51, 56, 60) stitches remaining.

Purl one WS row.

Next row (RS): K2, ssk, knit to end.
Next row (WS): Purl across.

Repeat these two rows 4 (5, 6, 7, 8) more times. You will have 37 (41, 44, 48, 51) stitches remaining.

Continue without shaping until armhole measures 4.5 (5, 5.5, 6, 6.5) inches, ending with a RS row.

Neck shaping:
Next row (WS): Bind off 10 (12, 13, 15, 16) stitches, purl to end.

Continue neck decreases on RS rows as follows:
Next row (RS): Knit to last 4 stitches, k2tog, k2.
Next row (WS): Purl across.

Repeat these two rows 11 (11, 11, 11, 11) times total. You will have 16 (18, 20, 22, 24) stitches remaining.

Continue without shaping until armhole matches back armhole depth, ending with a WS row.

Shoulder shaping:
Bind off 8 (9, 10, 11, 12) stitches at the beginning of the next RS row.
Purl one WS row.
Bind off remaining 8 (9, 10, 11, 12) stitches.

Right Front

Work the same as the Left Front, reversing all shaping. This means the armhole bind-off begins on a WS row, decreases are worked at the end of WS rows, and the neck bind-off begins on a RS row. The neck decreases are worked as ssk near the beginning of WS rows.

Sleeves (Make Two)

Cast on 46 (48, 50, 52, 54) stitches.

Ribbing: Work in 1×1 rib for 10 rows, ending with a WS row.

Continue in stockinette. At the same time, begin sleeve shaping:

Increase row (RS): K2, M1L, knit to last 2 stitches, M1R, k2.

Work the increase row every 10th row 8 (9, 10, 11, 12) times. You will have 62 (66, 70, 74, 78) stitches.

Continue without shaping until sleeve measures 13 (13, 13.5, 13.5, 14) inches from cast-on edge, or desired length for a three-quarter sleeve. Adjust here for a longer or shorter sleeve as you prefer.

Sleeve cap shaping:
Bind off 5 (6, 7, 8, 9) stitches at the beginning of the next two rows. You will have 52 (54, 56, 58, 60) stitches.

Next row (RS): K2, ssk, knit to last 4 stitches, k2tog, k2.
Next row (WS): Purl across.

Repeat these two rows until 20 (22, 22, 24, 24) stitches remain.

Bind off 3 stitches at the beginning of the next 2 rows.
Bind off remaining 14 (16, 16, 18, 18) stitches.

Assembly and Finishing

Block all pieces before seaming. This is one of the most important steps in knitting a garment from cotton or linen, and it genuinely transforms the finished result. Wet block by soaking each piece in cool water for 20 minutes, gently pressing out excess water in a towel (never wring), and pinning to measurements on your blocking mats. Allow to dry completely — cotton can take a full day or more.

Once dry, seam the shoulders together using the mattress stitch or your preferred seaming method. Set in the sleeves, easing the sleeve cap into the armhole, and sew the side seams and sleeve seams. Weave in all ends carefully.

Front bands and neckline: Using your smaller needle if you have one, pick up and knit stitches along the right front edge, around the back neck, and down the left front edge. A good rate for cotton is approximately 3 stitches for every 4 rows along the vertical edges, and 1 stitch per bound-off stitch across the neckline. Work 6 rows of 1×1 ribbing and bind off loosely in pattern. The front bands should lie flat without pulling or rippling — if they pull, try picking up fewer stitches; if they ripple, pick up more.

Give the finished cardigan one final wet block, paying attention to the seams and front bands, and allow it to dry flat before wearing.

Customization Ideas

One of the real joys of knitting your own garments is the freedom to make them entirely yours. Here are a few directions to take this basic pattern if you want to explore.

Add pockets. A simple patch pocket knitted separately and seamed onto each front makes this cardigan even more wearable. Cast on 22 stitches, work 4 inches in your chosen stitch pattern, work 4 rows of ribbing, and bind off. Position the pockets about 4 inches up from the hem and 1.5 inches from the front edge.

Try a textured stitch. The body is written in stockinette, but seed stitch, moss stitch, or a simple slip-stitch texture would all look beautiful and add visual interest without significantly changing the construction.

Go shorter or longer. The length before the armhole is easy to adjust. Just add or subtract rows, keeping in mind that each additional 30 rows adds approximately 4 inches in length.

Choose a different neckline. The gentle open neckline in this pattern can be deepened for a more dramatic V, or you can leave a wider band of stitches to pick up and add a small shawl collar.

Experiment with color. A contrast color for the ribbing, the sleeves, or even a single stripe across the back can turn a simple pattern into something really striking.

Caring for Your Summer Cardigan

Cotton and linen garments are generally easier to care for than wool, but they still benefit from gentle handling. Most cotton knits can be machine washed on a delicate or gentle cycle in cold water, but always check your yarn label to be sure. Lay flat to dry rather than hanging, as cotton is heavy when wet and can stretch significantly if left to hang or tossed in the dryer.

Pilling is less of a concern with cotton than with animal fibers, but if it does appear after a season of wear, a fabric shaver takes care of it quickly. Store your cardigan folded rather than on a hanger during the off-season to preserve its shape.

A Few Final Thoughts

This pattern has been designed to be a starting point as much as a finished design. Knitting from a pattern should feel like a conversation, not a strict set of rules, and we hope you feel free to adapt, adjust, and make this cardigan completely your own.

If this is your first garment, go slowly, take your time with the gauge swatch, and do not be discouraged if the