Check out the Sou Sou stores [textiles, tabi shoes/socks, clothing]. The 3 stores are all within a short distance of one another. Their website is: http://www.sousou.co.jp/
The stores are in a little dog-leg lane behind the OPA store on Kawaramachi, close to the Shijo-dori intersection. If facing the OPA building fron, go to your right and turn down the very small alley way, then left, then right and you’ll discover the little lane. Some of the coolest things. They are one of a very small group of textile-focused companies that has played a very big part in bringing back wool muslin cloth in Japan. You can find it made into hand-dyed scarves, among other things. Incredible craftmanship and quality in everything they make. Fabulous.
They’ve taken traditional designs and made them contemporary and cutting-edge. I can’t get enough of their products and wish they imported to the States. There are a few websites from which you can order in English, however.