T Time

This is surely the nearest I’ll ever get to giving fashion advice:

Iron-On Resistance: A gorgeous site design that matches the strong style of the products and keeps the interface simple (no stupid gimmicky menus or complex product configurators).
LaFraise (The Strawberry): Bold and colourful clothing from user-submitted designs, Threadless-style.
Spreadshirt US, Europe: Sell shirts you’ve designed. Having to set up separate shops for different regions is a pain, but otherwise looks pretty good (one to consider for malevole merchandise).
Airside Shop: Get yourself a Battle Royale T-shirt cheap in the sale at the moment. Just don’t wear it outside a school.
T-Shirt Forums: Discussion about the industry, handy if you’re looking for info on selling shirts.