Chest: Wrap the tape around the fullest part of the chest and across the shoulder blades. Keep it level and snug, but not tight.
Overarm: Measure around the fullest part of both arms and chest. If the overarm is more than seven inches larger than the chest, subtract seven from the overarm measurement to estimate jacket size.
Sleeve: Measure from the center back of the neck, over the shoulder and down the slightly bent arm to the wrist bone.
Waist: Measure around the natural waistline without pulling the tape tight.
Inseam: Measure from the crotch to the desired trouser length while wearing dress shoes if possible.