Prada Runway 2012 Fall. Trousers, trousers, trousers. That was the message at Prada. They were in every one of the collection's 41 looks, hit just above the ankle, and were cut straight — but not too slim. They came in black wool — sometimes bejeweled at the hem — and later, in a mix of Op Art-Brady Bunch-style prints. The idea of wearing pants under dresses was the main thesis.