Funny story there... This is the 2nd time I've done my Tanline Cammy costume. The 1st round I actually used a tan-in-a-bottle to *stain* my legs; no amount of exfoliating would remove the stain until about 3 weeks to a month later when it completely faded. Might have taken longer for me than for others considering that I am pale ass white by nature.
The 2nd round I got a helluva lot smarter and bought some water resistant body paint, which did the trick just fine and I was washing my tan down the drain later that night.