Jacket
Lay your jacket flat and buttoned on the floor. Measure across the chest at the highest point, armpit seam to seam.
Measure straight across the bottom of the jacket, edge to edge.
Flip your jacket over, and measure straight across from shoulder seam to shoulder seam.
Measure straight down the jacket from the top seam of the jacket where it meets the collar down to the bottom of the jacket.
Measure the arm of the jacket from the shoulder seam straight down to the bottom of the sleeve.
Measure straight across the cuff opening.
Vest
Lay your vest flat and buttoned on the floor. Measure across the chest at the highest point, armpit seam to seam.
Measure straight across the bottom of the vest, edge to edge.
Flip your vest over, and measure straight across from shoulder seam to shoulder seam.
Measure straight down the vest from the top seam of the vest where it meets the collar down to the bottom of the vest.
Shirt
Lay your shirt flat and buttoned on the floor. Measure across the chest at the highest point, armpit seam to seam.
Flip your shirt over, and measure straight across from shoulder seam to shoulder seam.
Measure straight down the shirt from the top seam where it meets the collar down to the bottom of the shirt.
Measure the arm of the shirt from the shoulder seam straight down to the bottom of the sleeve.
Pant
Lay your pants flat and buttoned on the floor. Pull the front waistband up so that it's flush with the back waistband. Measure across the waist from edge to edge.
Measure from the center crotch seam vertically up to the top of the front waistband.
Flip your pants over and measure from the center crotch seam vertically up to the top of the back waistband.
1" down from the crotch seam, measure straight across the thigh of the pant.
14" down from the crotch seam, measure straight across the knee of the pant.
Measure straight across the bottom of the pant leg.
Measure straight down the seam of the pant from the center crotch seam to the bottom of the pant leg.
Belt
Lay a good fitting belt flat on the floor and measure from end to end. Do not include the buckle in this measurement.