The designers pair up to wow Balmain's Olivier Rousteing with coordinated looks, and learn that creative chemistry can make or break a collaboration.

Tan and Gigi fire up their time machine, sending designers to past decades to find retro inspiration for contemporary looks. Hailey Bieber judges.

Three finalists have a chance to showcase their artistry and talent with a full collection of new styles — but only one can walk off the runway a winner.