ALength — from the highest point of the shoulder straight down to the bottom hem.
BShoulder — seam to seam across the back.
CChest — the full circumference all the way around, taken 1 in (2.5 cm) below the armhole. On a flat garment this equals the width across, doubled.
DSleeve — from the shoulder seam down the outer edge of the sleeve to the sleeve hem.
Note: Measurements are taken with the garment laid flat. Chest measurements show the full circumference. Compare with a similar T-shirt, and size up if between sizes or for a relaxed fit. Allow up to 0.5–1 in (1–2.5 cm) variation.