NEW YORK — Has leather lost its edge? Some say yes, some say no. But whatever people say about it, and whichever way it’s worn, leather is sizzling right now, from the trendy numbers in the junior market to the sexy looks from luxury goods companies. Here, one of the latter: Bottega Veneta’s leather skirt, worn with a silk and cashmere knit tank. For more on the material, see pages 4 to 7.