T1

From the bony point of your shoulder at the top to the other end. Best done with a jacket or shirt that fits well in the shoulders and you can just measure seam to seam at the top of the shoulders.

Circumference at thickest point, relaxed with arms by your side

Circumference where your front length measurement ends

Best measured with a jacket on. From the base of the collar down the middle of the jacket to the end of the jacket or wherever you would like the jacket to end. This is basically the zipper length.

From the bony point in the shoulder to about 1-2” below your wrist (personal preference). Best done with a jacket or shirt that fits well in the shoulders and you can measure from the top of the shoulder seam down to where you would like the jacket sleeve to end on you.

Unflexed, arms down.