http://www.ebay.com/itm/271576032886
This vintage cavalry shirt was made in the 1950s-early 1960s as a film costume for Warner Brothers westerns. The shirt has a strap going from the rear tail to buttons on the front, presumably to keep it tucked in while doing stunts, like the “beaver tails” on old wetsuits or football jerseys. The original brass buttons were removed, as were the shoulder boards, although the mounting hardware and reinforcement for those remains. It was almost definitely used in 1964’s big budget western, “A Distant Trumpet”, which starred Troy Donahue, Suzanne Pleshette and Diane McBain. The shirts in that film are recognizable by their high-cut bibs and full button placket, as opposed to the pullovers favored by the wardrobe departments on other cavalry movies like the John Ford / John Wayne cavalry trilogy.

Chest (pit to pit): 22-1/2″ (doubled – 45″)
Shoulder to shoulder: 18″
Sleeve (shoulder to cuff): 24″
Length (base of collar to hem): 27″