What is a shoulder seam

Short answer: The shoulder seam is the seam that runs from the neck out towards the sleeve. Where it ends decides whether a garment fits across the shoulders, and it is one of the easiest places to see if you chose the right size.

Where the seam runs

On most tops and sweaters, the shoulder seam joins the front and back on top of the shoulder. It starts at the neckline and runs out to the point where the sleeve is set in. That last part matters most for fit. It is where the shoulder seam meets the sleeve seam, and that point should sit in a specific place.

The seam should end on the shoulder edge

If the seam sits right on the edge of the shoulder, the size is right. That is where the shoulder turns down towards the arm and you can feel the bone under the skin. If the seam drops down the arm, the garment is too big. If it sits in on the shoulder, it is too small. See socks for women.

How to check it

Put the top on and stand in front of a mirror with your arms down. Look at where the seam between shoulder and sleeve lies. Feel for it with your fingers if it is hard to see. Then reach your arms forward as if grabbing something. If it pulls across the back, the shoulders are too narrow, even if the rest fits.

The one measurement you cannot change

A top can be taken in at the sides, and sleeves and length can be shortened. But the shoulder width cannot be moved without resewing the whole garment. That makes the shoulders the most important place to get right when choosing a size. If the shoulders fit, the rest can usually be adjusted. See most popular for women.

Oversize is a deliberate choice

In oversize styles, the seam sits on the upper arm on purpose. This gives a loose, relaxed look where the fabric falls softly over the shoulders. Here it is not a sign that the size is too big. Choose your usual size in an oversize style to get the look the design intends. See most popular at Copenhagen Bamboo.

If you are between two sizes

If you are between two sizes, let the shoulders decide. If your shoulders are narrow and the rest suits the larger size, the smaller one may work better, since the fabric gives a little. If your shoulders are broad, go for the larger size. A bit of extra room at the waist is easier to live with than a top that pulls across the back.

The seam and the fabric

A soft fabric with stretch gives a little more leeway, because it moves with you. A firmer fabric needs the shoulders to fit more precisely. That is why the same size can feel different in two styles. Always check where the seam sits rather than relying only on the size on the label.

Protect the shape in the wash

The shoulders are where clothes most often lose their shape, especially when hung wet on a hanger. The weight of the water pulls the fabric down, and the shoulder seam can end up sitting slightly further out than before. Dry clothes flat or drape them over a line at the middle. That way the shoulders keep their shape longer.

Frequently asked questions

Where should the shoulder seam sit

Right on the edge of the shoulder, where it turns down towards the arm. Then the size is right in the upper body, and the top does not pull when you move your arms.

What does it mean if the seam drops down the arm

That the garment is too big across the shoulders, unless the style is cut oversize on purpose. Then it is part of the design and not a sign of the wrong size.

Can you change the shoulder width

No, not without resewing the whole garment. That is why you should choose your size by the shoulders and have the rest taken in if needed.