I've never really bought any gaming apparel aside from the knock-offs (like a Space Invaders shirt without actually saying Space Invaders and the aliens being slightly modified to avoid potential lawsuits).
There are, however, some clothes I've really really wanted to get my hands on. My first and favourite piece of gaming cloth, so far, is Chuck Greene's biker jacket, which Capcom offered for 230 dollars:

The latest item I had my sights on is the official Final Fantasy XV attire, where you can get Noctis or Prompto's clothes for something as cheap as 13.000 fucking euros:


I like them, though...







