For such an inexpensive accessory, these armbands were truly the detail that made my outfit.  Without them, I was just some slightly overdressed hipster... but with them it was instantly clear that I was actually an early 20th century bartender or shopkeep, or card dealer or whatever.

I had two different tuxedo shirts to work with -- one white and one sandy brown -- and these armbands looked great with both. In fact, I was a little worried about the brown shirt at first, but in the end I think the black and white armbands looked even better with it than they did with the white shirt. They popped more and really sold the "old" look.