These liners are made to fit all Ten C coats with buttons inside to attach the liner, from the Field shirt to the Parka, even in most of the down Parka's the liner can be attached, with the inside buttons. The reinforced button holes, and the flaps at the sleeve end. It can be fastened in the neck, sleeves and front and the hood with the string that is in every hooded shell.
When reversed the down liner can be worn as a light down jacket. Two zip pockets have been added to the inside to make it more functional. When in doubt about the size, just take the shell size that is indicated inside your Ten C jacket you mean to attach it to.