Where to get it: Leather jeans, $248, paneled skirt $198, blazer $268, all by Gap. othing embodies a kick butt attitude better than black leather. That's why women who can hold their own and fight the world's evil forces on the big screen always wear it. Emma Peel of The Avengers, Batgirl, Trinity of The Matrix--they all donned it. And let's not forget the leather-clad X-women of the summer, Storm and Jean Grey.   The look is about to show up once again in this fall's Charlie's Angels. As Alex, one of the three crime-fighting babes, Lucy Liu's got the look down pat while executing her black belt karate moves like nobody's business. Getting the look yourself may require a little down-playing though (translation: head to toe leather just doesn't work off screen). Go easy, and go for one piece at a time. You'll still feel like you can kick some booty… - Lesa Hannah