YH is in "dress heaven", AKA the downtown L.A. studio of fashion designer Michael Costello, who sits down with us to talk about his journey from opening his first boutique at 15 to designing dresses for the likes of Katy Perry, Beyoncé, and Lady Gaga! He reveals his ideal woman to design for, plus he gives us tips on how to shop for your body type and shares his biggest hopes for the future of his career!