Men's Tops >> Chest size in inches.
Small: 34-36
Medium: 38-40
Large: 42-44
X Large: 46-48
XX Large: 50-52

Men's Underwear>> Waist size in inches.
Small: 29-31
Medium: 32-34
Large: 35-37
X Large: 38-40
XX Large: 41-43

Socks - Unisex >>
Small: Women's 6-9
Medium: Men's 6-9
Large: Men's 10+

Women's Longhaul Pants
Size / Waist / Hip
Size 2 / 26" / 36.5"
Size 4 / 27" / 37.5"
Size 6 / 28" / 38.5"
Size 8 / 29" / 39.5"
Size 10 / 30" / 40.5"
Size 12 / 31" / 42"

Women's Tops >> Bust/Chest size in inches.
X Small: 30-32
Small: 33-34
Medium: 34.5-36
Large: 36.5-38
X Large: 38.5-40

Women's Underwear >>
X Small: Size 0
Small: Size 2-4
Medium: Size 6-8
Large: Size 10-12

X Small: Size 0, 26 waist / 26.5 inseam
Small: Size 2-4, 28 waist / 27.5 inseam
Medium: Size 6-8, 30 waist / 28 inseam
Large: Size 10-12, 31.5 waist / 29 inseam
X Large: Size 14+, 33 waist/ 29.5 inseam