NEW YORK — Over-the-top luxury is back, and that includes plenty of exotic materials. Last season’s python trend paved the way for the current crocodile craze, and now both the genuine article and embossed leather versions are turning up everywhere. Here, Nicole Farhi’s crocodile-stamped leather trenchcoat (front) and Victor Alfaro’s leopard-printed kid coat trimmed with crocodile-stamped leather over a cashmere and silk sweater (back). For more, see pages 4 and 5.