Etymology

From Middle English gambison, from Old French gambeson, gambaison, from gambais, wambais ‎(“quilted jerkin”), from Medieval Latin wambāsium ‎(“doublet, waistcoat”), from Frankish *wamba ‎(“abdomen, belly”), from Proto-Germanic *wambō ‎(“belly, womb”): compare Middle High German wambeis, German Wams ‎(“waistcoat, doublet”), from Old High German wamba ‎(“stomach”). More at womb.