Hmm, I have always been a big fan of leather. I currently own three leather jackets (one black leather scuba style, one black leather bomber, and one pink leather soft moto style), a black leather blazer, a blazer with leather sleeves, a black leather trench, and leather pants. As far as faux leather, I have a pair of joggers, a pair of dress pants, a sheath dress, a dress with a faux leather skirt, a pair of leggings, a pair of leggings with faux leahter accents, a light colored trench with faux leather sleeves, and two faux leather skirts.
It SOUNDS like a lot, but honestly, I am about as far from "sexy" as they come, and I teach, so I am not running around in anything remotely inappropriate. I just like the slight edge leather or faux leather gives an outfit. The faux leather sheath dress ONLY goes out with a blazer or other topper and black tights to cut down on the questionable factor, and the faux leather skirts usually go out with big sweaters on top. The leggings and the genuine leather pants rarely go out at all, as they're just a little too... too.
This is not including any leather shoes/boots, as I prefer leather in shoes, and have a LOT of shoes.