This jacket is slightly lighter weight canvas but still made to the same style and high standard as the top of the range jackets. They only come ready made and we stock them in normal chest sizes in right hand.
The buttons screw in so they can be moved to allow for some adjustment. They also only come in the colours shown.
If you are unsure of which chest size to choose then measure your chest normally and then with your arms raised above your head and your elbows in front of you. You will find your chest will be smaller with your arms up but that is how you are in the prone position. If the jacket is to be used in the prone position go for the smaller size.
It is not necessary to do up the buttons on your jacket in the prone position. The jacket will be very stiff and tight when new but gradually with use it will mould itself to your body and become more comfortable.