Specs were (according to Flight Suits website):
http://www.flightsuits.com/leather_a2_hist_horse.html
Army Air Force A-2 specifications called for russet brown horsehide, wool cuffs and waistband, and a light brown cotton lining. The pocket and collar were secured with black oxide n****e snaps and the neck with a nickel hook-and-eye. Under the storm flap the jacket zipped up with an "interlocking fastening device."
Leather: 3-ounce horsehide.
Pattern: Back must be made from one piece of leather without any seams, sleeves from two pieces of leather, each front side from one piece.
Lining: 100% Cotton, russet brown, plain weave fabric, not rayon or acetate. The lining must be plain with no printing or silk-screened maps.
Knit 100% worsted wool cuffs and waistband with no seams
Zipper: Nickel zipper, not brass
Collar Hook: Nickel collar hook and eye, not black. The hook must be 5/16 inch wide and riveted on with a metal double eyelet.
Snaps: Black oxide size 4 n****e snaps. Collar snaps must be covered with lining fabric and be visible inside the lining.
Thread: Russet brown cotton thread sewn 8-9 stitches per inch 1/8 inch from edges of seams.
Hangar: Leather hangar, 3/8 X 3 inches, sewn through the back of the jacket
Epaulets: 1 3/4 inches wide at the shoulder, tapering to 1 1/2 inches at the collar. Box stitched on each end. The epaulet must be centered on top of shoulder, not toward the front or back..
Pockets: Pocket flaps must be gracefully curved, not cut straight from the edge to the center.
Pockets must have double row of stitching and be stitched across the corners.
Inspection: Must have an official AN inspection stamp on the lining back
