Integra wears a black double-breasted suit. I lucked out and found mine at Marshall's, but you can usually find them at mid- to high-level menswear stores. Her shoes are nice ankle-boots. If you can get some all-black Dr. Martens or loafers, you should be okay.
One of the most basic rules for survival on any planet is never to upset someone wearing black leather. (This is why protesters against the wearing of animal skins by humans unaccountably fail to throw their paint over Hell's Angels.) -- Terry Pratchett