Big size shoeshops in Japan

[Robert]

Hello all, I haven't had my holidays yet. In 2 weeks time from now I'm going to Japan for holiday. I'm going with a group of persons for a 3 week journey through Japan from the south (Fukuoka) to Tokyo. There is space for shopping in Kyoto and of course Tokyo. I'd love to see Tokyo, especially the Ginza area and Shibuya must be packed with shops. I wonder if the Japanese size "extra large" T-shirts are the European size "extra large" . My question is this : does anybody know if they sell in Tokyo or Kyoto shoes and boots in large sizes? I have European size 44/UK10/US12, what I've read is that the same as Japanese size 27, maybe larger. The best way to find out is trying them on, but then I have to know if they are available. Thanks in advance. Robert