Peter,
unfortunately, we are not able to provide you with business contacts. There are many organizations/web sites that are better suited to help you in business affairs. Have you tried contacting the commercial section of the Japanese embassy in your home country? Or likewise, your country's commercial section in Japan? They are usually very helpful.
As for some Japanese hip places in terms of fashion: Tokyo's most famous areas in this regard are Shibuya, Shinjuku, Harajuku and Aoyama.