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Long-sleeve T-shirts can fit your casual style and add just a smidge of extra warmth to cover your arms. When you get a nice little collection of long-sleeve T-shirts going, make sure you keep them neat in your drawers. You don't want to reach for your fave T-shirt and pull out a mess of wrinkles instead of crisp, clean cotton. Fold a long-sleeve T-shirt in a tidy square so it will be ready to whip on whenever you want it.