Jennifer Lopez is a fashion chameleon — her extra glam looks are unparalleled, and she sure knows how to rock a pair of jeans. Her best outfits, however, have one professional staple that makes her look like a total boss: an oversized blazer. Lopez reminded everyone just how chic business outfits can be when she stepped out in New York City in an oversized blazer and trousers. (Of course, with her signature sexy spin, a lacey black bra was peeki…