Measure the garment that already fits.

Button the jacket, lay it flat, and smooth it without stretching.

Chest

Straight across from the bottom of one armhole to the other, then compare that number—not a doubled chest circumference.

Shoulders

Seam to seam across the back, following the natural curve at the top.

Sleeve

From the shoulder seam to the end of the cuff along the outside edge.

Back length

From the bottom of the collar seam to the bottom of the jacket.

Fasten the shirt and lay it flat with the back facing up for collar and shoulder measurements.

Collar

Inside the collar from the center of the button to the far edge of the buttonhole.

Chest

Pit to pit with the fabric resting naturally.

Sleeve

Shoulder seam to cuff. If measuring from center back, note that method separately.

Length

Bottom of the collar seam to the longest point of the shirttail.

Fasten the waistband and align the front and back rises before measuring.

Waist

Across the aligned waistband. Double this flat measurement for circumference.

Rise

Crotch seam to the top of the front waistband.

Thigh

Across the leg approximately one inch below the crotch.

Inseam

Crotch seam to hem along the inside leg.

Marked size is the starting point. Last shape and width matter just as much.

Marked size

Record the complete size and width exactly as stamped.

Outsole length

Heel to toe along the longest point of the sole.

Outsole width

Across the widest point of the forefoot.

Fit reference

Compare against a shoe from the same maker or last when possible.