Not going far enough?

I think we have all seen this sign in dressing rooms but today when I was trying on pants I was thinking you know what, I hope people were wearing undergarments when/if they tried on these pants and the same goes for any other clothing I try on/buy. While I may not be "going commando" in the pants or a skirt or dress etc but it kinda creeps me out to think someone else might have.... But I do shop at thrift shops and who knows what people did in those clothes. I guess that is what washers and driers are for....