A dirndl is the name of a traditional feminine dress worn in Austria, South Tyrol and Bavaria. . During the Nazi period, the Mittelstelle German costume of National Socialist Women of the "Reich Dirndl is a diminutive form of the dated word Dirn(e) for "girl"; in the 20th century, Dirne . "German Beer Maid Costume".History · Modern European usage · North American usage · Name. Go back to the Old Country this Halloween with our collection of German costumes. Find a sexy beer girl costume or a German girl Halloween costume for.