The Garrison Shirt Jacket in British Khaki Dry Wax

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

Measure straight across the back of the jacket, 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 jacket, from the center of the neck seam to the bottom of the 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.