Shoulder measurement needs a clear distinction between body width and garment seam width. The jacket's sleeve construction influences which method is useful. A dropped shoulder should not be interpreted like a conventional tailored shoulder.
Identify the construction
Check whether the jacket has a defined shoulder seam, raglan sleeve or deliberately extended shoulder. For a conventional garment measurement, lay it flat and follow the supplier's seam-to-seam method. Avoid stretching the upper back to make it lie artificially wider.
For a body measurement, use the landmarks and posture the seller specifies. Another person can help keep the tape stable. Record whether the measurement follows a curve or a straight line.
Connect the number to fit
Try the jacket over its intended layer and inspect the shoulder line, collar and upper back. Reach forward and lift your arms gently. A numerical match does not guarantee the right shoulder slope or armhole shape.
If the body feels comfortable but the sleeve head dents or pulls, ask whether another cut would work better. Altering shoulder construction can be more involved than adjusting a waist, so assess this area before purchase.
What should a supplier receive?
Send the number, units, written method and a photograph where practical. Include the style and size of any reference jacket. For group orders, use representative fitting samples rather than relying on independently collected shoulder figures with inconsistent endpoints.
Related reading
Agreeing jacket measurement methods and tolerances. For another useful reference, see Fitting outdoor team jackets across sizes.
