You first need membership, then you create your shirt/pants/ect. Then Configure it and select sell, then change the prices and update.
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You can't.
You can only re-sell LimitedU items that you bought, which is always made by ROBLOX.
This is not possible.
Make a T-shirt (such as an Admin) or a shirt.
You can only get free stuff if Roblox makes an item that way.