a woman's outer garment having a drawstring, belt, or similar closing, at or below the waist, which causes it to blouse.
of or relating to such a garment, the style it exemplifies, or something considered to resemble this style, as a hairdo: a blouson dress; the blouson effect; a blouson bob.
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British Dictionary definitions for blouson
a short jacket or top having the shape of a blouse
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012