There are some nice stores at the GF as well. The ladies clothing shop carries some moderate designer labels such as Ralph Lauren and Eileen Fisher, although nothing you can't buy at Bloomingdales' or Nordstrom's. The men's shop is Lauren heavy, and also carries some Tommy Bahama.
The shop in Japan carries Mikimoto Pearls, although the only have blue box, not red box.
Although not clothing or jewelry, these are some other WDW shops with items taht are not found in many locales:
The GF Spa carries a decent representation of Jurlique products, but not the entire line.
Both France and Italy in Epcot have shops which carry a fair representative selection of wines. France also has a shop with fine French Perfumes.
For Royal Dalton china you should visit the Tea Caddy in the UK in Epcot.
Does anyone remember a shop in DTD years ago that carried Lancome cosmetics, or am I dreaming?
Anne