What to wear: This matching Barbie and Ken costume needs neon-yellow rollerblades, matching knee pads, and multicolored visor hats. For the rest of Barbie's look, you'll need a pink top and matching shorts, plus a long-sleeved white shirt dress. For Ken, you'll want to grab a multicolored vest and matching shorts, a hot-pink muscle shirt, and a neon-yellow fanny pack.