ha, i think UNIQLO is basically just the GAP in japan, it's a little plain for my taste, especially after seeing all the crazy stuff they sell in harajuku. It's cooler looking than the gap though, american style is too conservative.
Japan is bad about making different sizes though, there were a lot of cool clothes I would have bought but even at XL they were made for skinnier and shorter people (I'm 187cm). I'm kind of skinny too, so I don't know how anorexic you'll need to be to fit some of these.
One of the coolest styles in japan is that crazy "3 pants in one" style where it looks like you have 3 pairs of pants and theyre all unzipped, but it's really just one. None of those fit me either, but they were all too expenso
Taiwan is awesome with the night markets, since I didn't buy much in japan i got like 3 pairs of pants at the clothing market in taipei, you guys have cool deals with the wholesale stuff. Those fit me perfectly, but I don't know why since guys in japan my age seemed around the same height as me while in taiwan I was usually the tallest guy around