If your US fitted cap or EU hat size is not known, to determine your hat size, measure the circumference around your head, keeping the tape level and firm, across the temples and above the eyebrow ridges. Measure circumference of head just above top of ears. Wrap tape gently around head making certain tape lies midway on your occipital bone (that little bump in the middle of the back of your head). Don't pull the tape too tightly or your hat will fit that tightly. Measure 2 or 3 times to be accurate.
Chest (Across Nipples)
Measure yourself (LOOSELY) around the fullest part of your chest, with your hands by your side, and your chest expanded. Keeping the tape measure level. Have someone else do measuring for you.
Waist (Belly Button)
Measure yourself (LOOSELY) around the natural waistline (that is your belly button).
Inseam (Inside Leg)
Measure yourself from the crotch to where your trousers normally sit on your shoe.