How to measure:
Use a tape measure with cm. 
Wear underwear or very thin clothes for accurate measurements.

1. Chest:
Measure your chest under your arms, holding tape level. Be sure to cross over the shoulder blades and the fullest part of your chest.

2. Waist:
Measure your waist where the waistband normally sits.

3. Sleeve length:
Stand with the arm relaxed down the side of your body. Measure from the top of the shoulder seam, let the tape measure follow the outside of the sleeve to the desired length of the sleeve.

Check out the instruction video below – how to measure for shirts.