The Jack in Butter Oxford

Button up the shirt and lay it flat on a hard surface. Measure across the chest area of the shirt about an inch down from the underarm seam, and double that for the full chest measurement.

Spread out and flatten the collar, and measure the circumference from the center of the top button to the edge of the buttonhole.

Measure straight across the back of the shirt, from one shoulder seam to the other.

Measure from the top of the shoulder seam to the end of the cuff. Next, measure from the center back of the neck seam to the shoulder seam. Add these two values to get your sleeve measurements.

Measure straight down the back of the shirt, from the center of the neck seam to the bottom of the shirt’s hem.

Measure around the fullest part of your chest, keeping the tape parallel to the floor. The tape should be snug, but not too tight.

With your arm bent slightly, measure from the base of the center back of your neck, along your shoulder, then over your elbow to your wrist bone.