A girl can never have too many tees, and American Apparel's Thermochromatic Sheer Jersey T-Shirt ($34) boasts the unique ability to be two shirts in one. This super light jersey tee starts out as a solid color (grey, pink, blue, green), but when exposed to heat—say, from your hands—it changes to white. The result is a cool tie-dyed look that's never the same twice. [Thanks, Jay!]
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