batwing

:  shaped like the wing or wings of a bat the batwing doors of a saloon a batwing collar: such as a of a necktie :  worn in a bowknot and having ends of equal length a black batwing tie for evening wear b of a sleeve :  made with a deep armhole the batwing sleeves of a knitted blouse c of chaps :  having wide flared sides and snap or buckle fastenings he picked up the scarred batwing chaps — W. V. T. Clark