Free Pattern: Knit Summer Cardigan

There is something deeply satisfying about wearing a handknit garment you made yourself, and a summer cardigan sits at the top of that list. Light enough to throw over your shoulders on a breezy evening at the beach, polished enough to dress up a simple outfit, and personal enough to feel like a true expression of your craft — the summer cardigan is one of those projects that knitters return to again and again. This free pattern walks you through everything you need to knit your own summer cardigan from the bottom up, with simple construction, beginner-friendly shaping, and notes to help you customize the fit as you go.

Whether you are a newer knitter looking for your first garment project or an experienced maker wanting a relaxed seasonal knit, this pattern has been designed with clarity and wearability in mind. Grab your yarn, put on a podcast, and let’s get started.

Why Knit a Summer Cardigan?

Before we dive into the pattern itself, it is worth taking a moment to think about why a summer cardigan deserves a place in your project queue.

Most knitters think of summer as the off-season — a time when wool feels too warm and heavy projects feel impossible. But summer knitting does not have to mean tiny accessories. A lightweight cardigan in cotton, linen, bamboo, or a plant-fiber blend works up beautifully in warm weather and becomes one of the most-worn pieces in your wardrobe. Air conditioning in offices and restaurants can be brutal in July. A handknit cardigan in a breathable yarn is the perfect solution.

Summer cardigans are also ideal for knitters who want to practice garment construction without committing to miles of bulky yarn. Because lightweight yarns are thinner and the stitch counts are higher, you get more practice at reading your knitting, catching mistakes early, and developing tension consistency — all skills that make you a better knitter across every project you attempt.

And from a purely aesthetic perspective, a hand-knit summer cardigan is stunning. Stitch definition in cotton and linen yarns is exceptional. Even a simple stockinette body looks elevated and intentional. Add a bit of ribbing or a simple lace border and you have something that looks genuinely beautiful.

Materials You Will Need

Yarn: Approximately 800–1,200 yards of a DK weight cotton, linen, or cotton-linen blend yarn, depending on your size. Look for a yarn that has good stitch definition and is machine washable if ease of care matters to you. Some popular choices include Paintbox Cotton DK, Lion Brand 24/7 Cotton, Drops Safran, and We Are Knitters The Cotton. A yarn with at least some plant fiber content will give you that lightweight, breathable drape that makes summer cardigans so wearable.

Needles: US size 4 (3.5mm) circular needles, 32 inches or longer. You will also want a set of US size 3 (3.25mm) circular needles or DPNs for the ribbing, if you prefer a tighter ribbed edge. A longer circular needle allows you to lay the work flat as you knit flat pieces, which is especially helpful when working back and forth on a large number of stitches.

Notions: Stitch markers, a tapestry needle for seaming and weaving in ends, stitch holders or scrap yarn for holding sleeve stitches, a row counter (optional but helpful), and five to seven buttons approximately 15–18mm in diameter.

Gauge: 22 stitches and 30 rows over 4 inches in stockinette stitch on US size 4 needles. Gauge is especially important in garment knitting. Even a small difference of half a stitch per inch will result in a finished garment that is noticeably larger or smaller than intended. Please swatch, wash your swatch, and measure again before casting on.

Sizes: This pattern is written for sizes XS (S, M, L, XL, 2XL, 3XL). The finished bust measurements are 32 (36, 40, 44, 48, 52, 56) inches with approximately 2 inches of positive ease built in for a comfortable, relaxed fit.

Construction Notes

This cardigan is worked flat in two back pieces and two front pieces, then seamed at the shoulders and sides. Sleeves are picked up and worked flat or knitted separately and sewn in — both options are described below. The button band is worked last by picking up stitches along the front edges.

This construction is ideal for knitters who are newer to garment making because it breaks the project into manageable pieces. You never have to worry about managing a large number of stitches all at once, and seaming gives the garment structure and stability that many lightweight yarns benefit from.

If you prefer seamless construction, you can adapt this pattern to be worked in the round by joining the back and fronts at the cast-on and placing markers at the side seam positions. The shaping remains the same; you will simply need to eliminate the seam allowances and join at the underarm.

Pattern Abbreviations

k — knit
p — purl
k2tog — knit two stitches together (a right-leaning decrease)
ssk — slip, slip, knit (a left-leaning decrease)
sts — stitches
RS — right side
WS — wrong side
pm — place marker
sm — slip marker
rep — repeat
BO — bind off
CO — cast on

The Pattern

Back

Using your larger needles, CO 90 (100, 112, 122, 132, 144, 154) sts.

Ribbing Setup Row (WS): K2, p2; rep from to last 2 sts, k2.
Ribbing Row (RS): P2, k2; rep from to last 2 sts, p2.

Continue in ribbing as established for 1.5 inches, ending with a WS row.

Body:
Switch to stockinette stitch (knit on RS, purl on WS) and work even until piece measures 13 (13.5, 14, 14, 14.5, 14.5, 15) inches from cast-on edge, ending with a WS row.

Armhole Shaping:
BO 5 (6, 7, 8, 9, 10, 11) sts at the beginning of the next 2 rows. 80 (88, 98, 106, 114, 124, 132) sts remain.

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

Repeat these two rows 4 (5, 6, 7, 8, 9, 10) more times. 70 (76, 84, 90, 96, 104, 110) sts remain.

Work even in stockinette until armhole measures 7.5 (8, 8.5, 8.5, 9, 9.5, 9.5) inches, ending with a WS row.

Shoulder and Neck Shaping:
BO 8 (9, 10, 11, 12, 13, 14) sts at the beginning of the next 4 rows.
BO remaining 38 (40, 44, 46, 48, 52, 54) sts for the back neck.

Left Front

Using your larger needles, CO 44 (50, 56, 60, 66, 72, 76) sts.

Work ribbing as for Back for 1.5 inches, ending with a WS row.

Work in stockinette until piece measures the same as the Back to armhole shaping, ending with a WS row.

Armhole Shaping (Left Front):
BO 5 (6, 7, 8, 9, 10, 11) sts at the beginning of the next RS row. 39 (44, 49, 52, 57, 62, 65) sts remain.

Work one WS row.

Decrease row (RS): K2, ssk, knit to end.
Work one WS row.

Repeat these two rows 4 (5, 6, 7, 8, 9, 10) more times. 34 (38, 42, 44, 48, 52, 54) sts remain.

Work even until armhole measures 5 (5.5, 5.5, 6, 6.5, 7, 7) inches, ending with a RS row.

Neck Shaping (Left Front):
BO 8 (9, 10, 10, 11, 13, 13) sts at the beginning of the next WS row. Work to end.

Decrease row (WS): P2, p2tog, purl to end.
Work one RS row.

Repeat these two rows 2 (2, 3, 3, 4, 4, 4) more times. 23 (26, 28, 30, 32, 34, 36) sts remain.

Work even until armhole measures the same as the Back, ending with a WS row.

Shoulder Shaping:
BO 8 (9, 10, 11, 12, 13, 14) sts at beginning of next 2 RS rows. BO remaining 7 (8, 8, 8, 8, 8, 8) sts.

Right Front

Work as for Left Front, reversing all shaping. This means armhole shaping will begin on a WS row, and neck shaping on an RS row. The decreases mirror those of the Left Front.

Sleeves (Make Two)

Using your smaller needles, CO 48 (50, 52, 54, 56, 58, 60) sts.

Work in k2, p2 ribbing for 1 inch.

Switch to larger needles and stockinette. On the third RS row, begin sleeve shaping.

Sleeve Increase Row (RS): K2, m1L, knit to last 2 sts, m1R, k2.

Repeat this increase row every 8th row 8 (9, 10, 11, 12, 13, 14) times. 64 (68, 72, 76, 80, 84, 88) sts.

Work even until sleeve measures 6 (6, 6.5, 6.5, 7, 7, 7.5) inches from cast-on, or desired length. This is designed as a short summer sleeve — if you prefer a three-quarter sleeve, simply continue working even until the sleeve reaches your desired length before beginning cap shaping.

Sleeve Cap Shaping:
BO 5 (6, 7, 8, 9, 10, 11) sts at beginning of next 2 rows.

Decrease row (RS): K2, ssk, knit to last 4 sts, k2tog, k2.
Work WS row even.

Repeat these two rows until 24 (26, 26, 28, 28, 30, 30) sts remain.

BO 3 sts at beginning of next 4 rows.
BO remaining 12 (14, 14, 16, 16, 18, 18) sts.

Assembly

Block all pieces before seaming. This step is genuinely transformative with plant fiber yarns. Wet blocking will open up the stitches, even out your tension, and give the fabric a beautiful drape that you simply cannot achieve without it. Pin pieces to your measurements and allow to dry completely before seaming.

Seam shoulders using the mattress stitch or Kitchener stitch for a flat, nearly invisible join. Set in sleeves by pinning the center of the sleeve cap to the shoulder seam and working outward to each underarm. Use mattress stitch for the sleeve seam and side seams.

Weave in all ends.

Button Band

With your smaller needles and RS facing, pick up and knit approximately 3 stitches for every 4 rows along the right front edge. The exact count will vary by your tension, but you want the band to lie flat without pulling or rippling. A good rule of thumb is to pick up stitches evenly and then adjust after the first row if needed.

Work in k1, p1 ribbing for 3 rows.

On the 4th row, work buttonholes evenly spaced. For a 5-button cardigan, mark the placement of your top and bottom buttons first, then space the remaining three evenly between them.

Buttonhole: K2tog, yo.

Continue in ribbing for 3 more rows. BO in pattern.

Repeat for the left front edge, omitting buttonholes.

Sew buttons to the left front band opposite the buttonholes.

Finishing Touches and Customization Ideas

The beautiful thing about a simple cardigan pattern is how much room it leaves for personal expression. Here are a few ways you might make this pattern your own.

Add a lace border. Instead of a simple ribbing at the hem, try a simple eyelet lace pattern. A four-row repeat of k1, yo, k2tog can create a delicate, airy edging that suits the summer aesthetic perfectly.

Try a contrast color. Work the ribbing, button band, and sleeve cuffs in a contrasting color for a sporty, graphic look. A neutral cardigan body with a pop of color at the edges is a classic combination that never goes out of style.

Go sleeveless. Omit the sleeves entirely and finish the armhole edges with a simple picked-up ribbing border. A sleeveless cotton cardigan is an incredibly versatile layering piece.

Lengthen the body. For a tunic-length cardigan that pairs beautifully with leggings or wide-leg trousers, simply add length to the body before beginning armhole shaping. Add approximately 30 rows for each additional 4 inches of length.

Play with stitch texture. The body of this cardigan is worked in simple stockinette, but a seed stitch or moss stitch body would give it an entirely different personality — more textural, more artisan, slightly more substantial despite still being lightweight.

Tips for Knitting Lightweight Yarns

If you are newer to knitting with DK weight cotton or linen, a few tips will make the process much more enjoyable.

Cotton has very little elasticity compared to wool, which means your hands may tire more quickly at first. Take breaks, stretch your fingers, and consider using wooden or bamboo needles, which have more grip than metal and help prevent stitches from sliding off unintentionally.

Linen starts out feeling quite stiff and even scratchy, but it softens dramatically with washing and wearing. Do not judge a linen yarn by how it feels on the skein or even in the finished object — wash it, wear it, and watch it transform.

Plant fiber yarns are heavier than wool at equivalent yardage, so your finished cardigan will have a lovely drape and weight to it. This is part of what makes it so beautiful, but it also means the garment can grow slightly with wear. Sizing down half a size from what you might normally choose is a reasonable approach if you are between sizes.

Care Instructions

Hand wash your finished cardigan in cool water with a gentle detergent designed for delicates. Lay flat to dry, reshaping gently as needed. Most plant fiber yarns hold up well to machine washing on a delicate cycle in a mesh bag, but always check the label of your specific yarn to be sure. Avoid the dryer, which can cause cotton and linen to shrink and stiffen.

Store your cardigan folded rather than hanging to prevent the fabric from stretching over time.

A Note on Gauge and Fit

Garment knitting asks more of you than a hat or a pair of mittens, and the most important thing you can do to set yourself up for success is to take your gauge seriously. Knit a swatch that is at least 6 inches square, wash and block it the same way you plan to treat the finished garment, and measure it once it is completely dry. If your gauge is off, adjust your needle size and swatch again.

Also take the time to compare your measurements to the schematic before choosing a size. The finished bust measurement listed for each size includes approximately 2 inches of positive ease, meaning the garment is intended to be 2 inches larger than your actual bust measurement. If you prefer a more fitted look, size down; if you like a relaxed, drapey silhou