This happened to me with a pair of Nike 3/4 leggings that i'd worn once to do groceries. Listed in gym wear, 3 hours before the auction ended - BAM removed from ebay. 

I waited a month. Sold them in the Clothing> Pants category instead. Got more watchers and bids than I had in the Gym section. eBay didn't remove it. Got good feedback. All is well 😛