I am not a shopper, so it is probably surprising that my choice for the letter 'G' is not one, but two Russian Department stores, GUM on Moscow and Gostiny Dvor in Saint Petersburg.
Gostiny Dvor is in Saint Petersburg. I did go into a store to buy a soccer jersey for my grandson. Since I somehow took no street views of the large store (huh?), here is one of Charlie in a jersey for the FC-Zenit Football Club: