THIS IS NOT YOUR AVERAGE LAB COAT.
  It's meant to be fitted with lots of stretch to allow for comfort. Order your size like its a blazer.  Measured in Inches: 

Sizes	38	40	42	44	46	48
Chest	37-38	39-40	41-42	43-44	45-46	47-48
Waist	30-32	32-34	34-36	36-38	38-40	40-42
Hip	37-38	39-40	41-42	43-44	45-46	47-48

 HOW TO MEASURE: 

CHEST: Measure across the fullest part of your chest

WAIST: Measure around your waist around your narrowest point

HIP: Measure around your fullest part of your hip.