(a) NECK
Measure around the base of your neck, under your Adams apple, where your shirt collar sits, with enough room for two fingers to fit inside
(b) CHEST
Measure around your chest, close up under your armpits, at the fullest part
(c) WAIST
Measure your waist, where the waistband of your pants sit
(d) INSIDE LEG
Measure your inside leg, from your crotch to your ankle – or measure the inside seam of one of your pants that fit you well