I am familiar with the materials manufacturer Teijin:
http://www.teijin.co.jp/japanese/index.html

They have developed some advanced technologies and they have a high quality reputation. Their materials are used by some leading apparel brands. I wasn't aware that they had a retail presence. Can you post a link to the men's shop that you refer to?

EDITED - Oh... This shop?
http://www.tjnaso.co.jp/company.html
Never been there. Sorry. Looks kind of old school to me. It crossed my mind that it would be kind of funny to get a made-to-measure suit in a place like that. But I'd guess that the cost savings in Hong Kong would probably justify the trip...