Take a cue from Givenchy, Stella McCartney, and 3.1 Phillip Lim: A hint of leather goes a long way for Fall 2011. Cold-weather classics in cozy wool and collegiate tweed get tough with the addition of patchwork panels, contrast sleeves, and a bit of downtown trim. Click through for 26 super-chic leather-accented pieces — from a collared Cushnie et Ochs blouse to a DKNY colorblock coat.