Sizes can vary from 2-3 centimeters because they are measured by hand. 1inch=2.54cm The size matched on a label can differ from the one you have ordered 

• Sleeve: Measure from the middle of the back of the neck, out to the shoulder, and down to the wrist.
• Chest/Bust: Measure circumference around the widest part chest/best
• Waist: Measure natural waist where pants sit (think regular rise pants).
• Hips: Stand straight and measure around the largest circumference at hips.
• Inseam: Measure inside seam from crotch to bottom hem.