I recently picked up a new Rago waist cincher at a specialty lingerie store that I have shopped at numerous times, both in drab and while dressed. The cincher came with detachable garters which I typically don't use. Normally I would just remove them and forget about them but since I had them I figured I would get some stockings to go with the cincher.
So about a week later I went back to the same store in search of stockings. Normally the staff at this store treats me no differently than any other customer but since I was in drab, it's Christmas season and the woman who greeted me may have been a seasonal hire this time was different. I think she assumed I was shopping for my wife.
I explained that I was looking for stockings that did not have silicone bands at the top to be worn with garters. She started to show me their offerings and then started to explain things to me as she tried to ascertain specifically what I wanted. She started to tell me all about denier which "sort of tells you how heavy or how see-through they are". Then she showed me another pair that "have a little line that goes up the back" etc.
She was super nice and helpful and I found what I was looking for. I think she is just used to most guys coming in without a clue so that is what she was expecting.
So now I have a feeling for what it must like to be "mansplained", the big difference being that this woman was being solicitous and helpful while mansplaining is typically more condescending in nature.