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Chest measurement is from center of armpit to the other across the front
Waist measurement is from the top of back collar to waist
Size small 18 inch chest 28 inch waist
Size medium 20 inch chest 29 inch waist
Size large 22 inch chest 30 inch waist
Size extra large 24 inch chest 31 inch waist
Size double extra large 26 inch chest 32 inch waist