I never ever feel like going shopping or trying stuff on but whenever I'm in Tokyo I go to ragtag/rinkan/space/etc etc all the time, it's like a drug. cause you never know when you'll find that amazing piece from some collection 5 years ago at a great price but you know for sure that it'll be gone by the next day...
+1, had some nice pickups from ragtag/space/heatwave - Shibuya stores always seem the best, Harajuku ones are good for streetwear too but I never seem to find much at the Shinjuku ones. Most Japanese treat their clothes good so most stock looks new/near new (often even current season!).