Contrary to what you have read about Ginza shoppings (Luxury brands & can see but cannot buy)..I actually shop till I drop in Ginza especially during the opening of Uniqlo Ginza in Mar this year haha.. Lotsa 50% cloths/sweaters & downs..And surrounding malls/ fashion shops are equally good & similar pricing to those in Shibuya.

Ginza is good combining your trip near Tokyo Main stn area & King Palace. And during weekend there is an interesting flea market at Tokyo Forum near Tokyo stn..Lotsa antiques, kimono & etc...