Take your clothes out of the dressing room
Unless specifically told to leave your clothing in there, always assume you should take everything out of the dressing room once you're done. This seems to be a confusing task to most, but just because yes, it is our job to keep the fitting rooms clean, doesn't mean you're above giving us a little help and emptying it for us. Bonus points if you put everything back onto the hangers instead of handing us the clothing and hangers separately.
[Photo via @260samplesale]