Martingale (clothing)

A martingale (also martingale belt) is a strap on a dress or a half-belt on a coat or a jacket, used to adjust the fullness of the cloth.

The martingale is typically attached to the piece of clothing by buttons. In a military overcoat, a martingale is a common and practical feature, as a pleated coat can be spread out as a blanket once the strap is unfastened.