A martingale (also martingale belt[1]) is a strap on a dress or a half-belt on a coat or a jacket,[2][3] used to adjust the fullness of the cloth.
The martingale is typically attached to the piece of clothing by buttons.[4] 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.[5]