Oh man. I loved Summer Sands. I hope Trend-E proves to be a store with more stylish Disney-inspired stuff but also has a good selection of non-Disney fashions. I love love love to shop but I don't want to buy everything Disney while I'm there. I like to pick up a few pieces that aren't of the mouse.
Now that I think about it, I noticed more than one shop where you could find merchandise similar to what Summer Sands had. The Bou-Tiki at the Polynesian has some Roxy stuff but they also carry a lot of Tommy Bahama as well as some other similar but not as expensive stuff. Also, when walking from the hub to PotC, I don't know the name of the shop but it's on the right just past the place where you get the Dole Whips and the restrooms. Aaand, at DTD there's Sammy Duval's Curl which is all surf/skate type brands. There was tons of the standard labels in there like Roxy, Kyra, Billabong, etc. They even carried Uggs (which were all on sale).