The Collaborative International Dictionary of English v.0.48:
beret \beret\ n. a cap made of soft cloth with no brim or bill, widening somewhat outward from a close-fitting headband to a flat top, which often has a button or tab in its center. [WordNet 1.5 +PJC]WordNet (r) 3.0 (2006):
beret n 1: a cap with no brim or bill; made of soft cloth