Billie Eilish has ditched covering up and stripped down to a tartan schoolgirl miniskirt, complete with ball-and-chain bondage action and big stomping boots. The 19-year-old pop sensation, known for her baggy shorts and matching skirts, today broke the mold in a rare Instagram share showing her killer legs, with the "bad guy" singer reminding her 76.4 million followers that custom-made Gucci bagginess ain't all she wears. Kicking off with her trademark slouchy look, the teen quickly upped the ante, and Instagram is thanking her. Check it out below.