Black Tumi
Thats what most consultants get. You'll write it off as job expense.
Unless of of course you want to be a little different. At your age and the stage of your career, however, you are probably more worried about not screwing up the firm's partners' image. Right now you have to fit in with the culture and the look. At least I hope you have good shoes and are not running around with douche bag stuff like Kenneth Cole, or Aldo.
If you need some style advice check styleforum.net.