My favorite Japanese clothing designer of all times has to be h.NAOTO! I really like his eclectic style of gothic/steampunk/fantasy mix in all of his clothing. Very creative and unique clothing I have not seen much from many American designers! Overall, his site is very bold and simplistic. Easy to navigate and to look at all new and older collections that he has on display on the site. To be blunt, I drool at the clothing daily wishing I could afford it!
Here is the official site: h.NAOTO
You might need to use a Japanese to English translator to read what certain parts of the site say in Japanese, but other then that it is perfectly readable.