Using chest measurements we can calculate other upper body measurements.This is for standard body measurements.But to get good measurement it is good to take measurement of each part.
Neck= ⅓ chest + 2½"
Waist =chest -5 to 7 "
Seat = Chest + 2 to 4"
Across chest = ⅛ th chest + 2¼"
Half back =⅙ th chest + 1"
Half shoulder =⅙ th chest 1½ to 2"
Upper arm or biceps = ¼ chest + 2 to 2½"
Scye depth =⅛ th chest + 2 to 2½"