Measurments for all kind of polo's and t-shirts

A: Shoulder width (cm) 
Lay the garment flat, with the back faced down. Measure from where the shoulder seam meets the sleve on the one side of the garment straight across to where the shoulder seam and sleeve meet on the opposite side.

B: Chest (cm) 
Lay the garment flat, with the back faced down. Measure from armpit to armpit and multiply by 2.

C: Body length 
Pop the collar so that the melton (felt) is visible beneath the collar. Start from the intersection of the back collar and measure down along the center back seam to the bottom hem of the garment.