Raglan Sleeve Drafting Explained

The raglan's signature is the diagonal seam from underarm to neckline and the absence of a separate shoulder seam on the body. The sleeve carries the top of the shoulder, so it must be shaped over the shoulder rather than lying flat, which is why a raglan sleeve has either a shoulder dart or a curved seam along its top.

Because the seam runs into the neckline rather than sitting on the shoulder, the raglan spreads stress across a longer, more diagonal line, which is gentler on the shoulder and allows a wide range of arm movement.

1. 1.Start with matching bodice front, bodice back and a one-piece sleeve block.
2. 2.On the bodice, draw the raglan line from a point on the neckline diagonally down to a point on the armhole near the underarm.
3. 3.Repeat on front and back, keeping the underarm end points at the same level.
4. 4.Mark notches across the style line so the sleeve and body realign after cutting.
5. 5.Cut the upper armhole sections away from the bodice; these will transfer to the sleeve.

The upper armhole pieces cut from the bodice front and back are matched to the top of the sleeve at the shoulder point, so the sleeve inherits the shoulder. When you join them, the sleeve head gains the shoulder slope, and this creates the need to shape the sleeve over the shoulder curve.

Confirm that the cut edges of the bodice armhole sections match the corresponding edges of the sleeve head, because these seams must sew together. Walk them carefully; a raglan that does not match at the armhole is very visible.

The top of a raglan sleeve must curve over the shoulder, and this shaping is handled in one of two ways. A one-piece raglan puts a shoulder dart from the neckline down the top of the sleeve to remove the excess and build the shoulder curve. A two-piece raglan replaces that dart with a seam running along the top of the sleeve, from neck to wrist, which gives a smoother, more tailored shoulder.

The two-piece version is common on coats and jackets because the top seam can be shaped precisely and pressed open. The one-piece dart version is simpler and typical of knits and casual wear, where a soft shoulder is acceptable.

• The diagonal seam allows a wide range of arm lift with little bodice drag.
• The soft shoulder line suits outerwear worn over other garments.
• There is no shoulder seam to press or match, simplifying construction.
• The style adapts easily to knits, where set-in sleeves can be fiddly.
• The neckline seam junction lets you fine-tune shoulder fit without touching the armhole.

A raglan pattern depends on accurate notches across the diagonal seam and a correctly shaped sleeve head, so the shoulder transfer reproduces cleanly. Minerva Patterns supplies raglan garments as DXF AAMA, PLT and PDF, with the diagonal seam notches and shoulder shaping marked, whether the design uses a one-piece dart or a two-piece top seam.

Once you understand the raglan as a redistribution of the armhole and shoulder, you can move the style line, choose the shoulder treatment and tune the mobility to the garment, from a fitted coat to a relaxed sweatshirt.