What a Raglan Sleeve Is and Why You Start at the Neck

A raglan sleeve is a sleeve that runs all the way from the neckline to the underarm in one continuous piece, with a diagonal seam running from the armpit to the shoulder. Unlike a set-in sleeve (which requires binding off and sewing), a raglan is knit as part of the body, so you have fewer seams to sew and the fit is often more comfortable across the shoulders.

The easiest way to knit a raglan is to start at the neck and work downward. You cast on stitches around the neckline, then increase stitches in a pattern that creates the diagonal raglan lines. As you knit down, the body and sleeves grow at the same time. When you reach the underarm, you separate the sleeves from the body and finish each piece independently.

This method is faster than knitting pieces separately and sewing them together, and the increases are visible and decorative—many patterns use them as a design feature rather than hiding them.

Key Takeaways

  • A raglan sweater is knit in one piece from the neck down, with increases that create diagonal lines from the neckline to the underarm.
  • You will need a pattern that specifies stitch counts for the neckline, the number of increase rounds, and where to separate the sleeves from the body.
  • The four raglan lines (two on the front, two on the back) are increased every other round or every round, depending on the pattern's fit and style.
  • Once you reach the underarm, you place the sleeve stitches on holders and continue knitting the body separately until it reaches the desired length.
  • Finishing involves binding off the body, picking up the sleeve stitches, and knitting each sleeve from the underarm to the cuff.

Choosing a Pattern and Gathering Your Materials

Start with a pattern written specifically for a top-down raglan. Patterns designed for bottom-up or seamed construction will not work without significant modification. Look for patterns that include a schematic showing the finished measurements and a clear diagram of where the raglan increases happen.

You will need yarn in the weight and yardage the pattern calls for, circular needles in the size recommended by the pattern, and a set of double-pointed needles or a shorter circular needle for the sleeves once you separate them. Have stitch markers, a yarn needle for weaving in ends, and scrap yarn or stitch holders to hold stitches while you work on other parts.

Read through the entire pattern before you cast on. Raglan patterns often use abbreviations like "M1" (make one increase) or "yo" (yarn over), and knowing these in advance prevents mistakes. If the pattern uses a stitch you have not done before—like a lifted increase or a yarn-over increase—practice it on a swatch first.

Casting On and Setting Up Your Increases

Cast on the number of stitches the pattern specifies for the neckline. This is usually between 60 and 100 stitches, depending on the sweater size and neckline style. Use a long-tail cast-on or the cast-on your pattern recommends, and join to knit in the round without twisting.

Place a stitch marker at the beginning of the round. The pattern will tell you where to place additional markers to divide the front, back, and two sleeves. A typical setup looks like this: marker, front stitches, marker, right sleeve stitches, marker, back stitches, marker, left sleeve stitches. The markers sit exactly where the raglan increases will happen.

Knit a few rounds plain (without increases) to establish the neckline ribbing or stockinette, depending on your pattern. This gives you a finished edge at the neck before the increases begin. Then start the increase round: on the round after your ribbing ends, you will knit one stitch before each marker, increase one stitch, knit to the next marker, increase one stitch, and repeat around. This creates four new stitches per increase round—one on each side of each of the four markers.

Working the Increase Rounds Until You Reach the Underarm

Most raglan patterns increase every other round or every round, depending on how much shaping the sweater needs. Patterns that increase every round create a more fitted shoulder; patterns that increase every other round are looser. Follow your pattern exactly, because the number of rounds between increases affects the final fit.

As you work, the four raglan lines become visible diagonal lines of increases running from the neckline toward the underarm. Some patterns hide these increases inside the fabric; others make them a design feature by using yarn-over increases that create small eyelet holes. Either way, the increases are your guide—if the lines look even and symmetrical, you are on track.

Keep track of which round you are on. Write it down or use a row counter. Raglan sweaters typically require 20 to 40 increase rounds before you reach the underarm, depending on the size and how much ease (extra room) the pattern includes. Your pattern will tell you exactly when to stop increasing and separate the sleeves.

Separating the Sleeves from the Body

When you reach the round where the pattern says to separate, you will have significantly more stitches than you started with. The pattern will tell you how many stitches are now in the front, back, and each sleeve. Knit to the first sleeve marker, then place all the sleeve stitches (usually 40 to 80 stitches) onto a holder or spare circular needle. Do not bind them off—you will knit them later.

Cast on new stitches under the arm to replace the ones you just removed. This creates the underarm seam. The number of stitches to cast on is usually 1 to 4, depending on the pattern. Use a backward-loop cast-on or the method your pattern specifies, because these stitches need to be loose enough to knit into smoothly.

Repeat this process for the second sleeve, placing those stitches on a separate holder. Now you have the body stitches on your needle and both sleeves safely stored. Continue knitting the body in the round until it reaches the desired length—usually to the hip or just below the waist, depending on the sweater style.

Finishing the Body and Knitting the Sleeves

Knit the body straight (no more increases) until it is about 1 to 2 inches shorter than your target length. This accounts for the ribbing you will add at the hem. Knit the ribbing (usually 1x1 or 2x2 rib) for 1 to 2 inches, then bind off loosely. Cut the yarn and weave in the end.

Pick up the first set of sleeve stitches from the holder. Using your smaller circular needle or double-pointed needles, knit the sleeve stitches. Pick up one stitch in each of the cast-on stitches you made under the arm, then knit around. You now have a tube of stitches that forms the sleeve.

Knit the sleeve straight down to the wrist, decreasing a few stitches every 1 to 2 inches if the pattern calls for it. Most patterns taper the sleeve slightly so it fits snugly at the cuff. When you reach the desired length, knit the cuff ribbing (usually 1x1 or 2x2 rib for 1 to 2 inches) and bind off. Repeat for the second sleeve.

Common Mistakes and How to Avoid Them

The most common mistake is losing track of which round you are on during the increase section. Use a printed pattern with boxes you can check off, or keep a row counter visible. If you miss an increase round, you will notice the raglan lines become uneven—the diagonal will have a gap. If this happens, you can pick up the missed stitch and knit it in on the next round, or frog back to the missed round and redo it.

Another frequent error is casting on too many or too few stitches under the arm when you separate the sleeves. If you cast on too many, the underarm will be loose and baggy. If you cast on too few, the armhole will be tight and uncomfortable. Count the cast-on stitches twice before you knit the first round of the separated body.

Tension changes are also common when you switch from knitting in the round on a large needle to knitting sleeves on smaller needles. Your sleeve stitches may be tighter than your body stitches. Knit the first few rounds of the sleeve slowly and deliberately, and check that your tension matches the body before you continue.

Frequently Asked Questions

What if my raglan lines are not even on both sides?

Uneven raglan lines usually mean you missed an increase on one side or increased on the wrong round. Check your stitch count against the pattern. If one side has fewer stitches than it should, you can pick up the missed stitch with a crochet hook and knit it in on the next round. If the lines are only slightly off, they will even out as you continue knitting and the fabric relaxes.

Can I knit a raglan sweater in pieces instead of in the round?

Yes, but it requires a different approach. You would knit the front, back, and two sleeves separately, then seam them together. This is more common in patterns designed for flat knitting on straight needles. Most modern raglan patterns are written for circular needles and in-the-round knitting because it is faster and requires fewer seams.

How do I adjust the sleeve length if I am taller or shorter than the pattern assumes?

Measure from your shoulder bone to your wrist bone, then compare that to the schematic in your pattern. If you need longer sleeves, knit the body and sleeves longer before you add the cuff ribbing. If you need shorter sleeves, knit them shorter. The body length can be adjusted the same way—knit it longer or shorter before you bind off, as long as you keep the ribbing the same width.

What happens if I run out of yarn before the sleeves are finished?

If you are running low on yarn, you can bind off the sleeves shorter than the pattern specifies, or switch to a thinner yarn of a similar color for the cuffs and ribbing. You can also knit the sleeves in a contrasting color if your pattern allows it. Weigh your yarn as you go during the body section so you know how much is left for the sleeves.

Do I have to use yarn-over increases for the raglan lines, or can I use other increases?

You can use any increase method your pattern specifies. Yarn-overs create visible eyelets and are decorative; lifted increases or make-one increases are invisible and blend into the fabric. Follow your pattern's instructions, because the choice affects the look of the finished sweater. If your pattern does not specify, choose the method you are most comfortable with.