Did some shopping yesterday.
Sizes in Japan tend to be smaller than in Europe. I'm usually medium in Europe, but I'm large here. It has even happened that large was a bit too small, and they didn't have anything larger than large in that specific store.
Regarding the stores. You can as usual find more stores for women than for men, and the stores for women are larger than the ones for men, but it's still easy to find nice things to buy.
Btw, looks like they sell lots of jewellery and bling bling for men, and shopping bags for men looks nicer than for women.
I will now have some breakfast, and then head to the Ginza district.