That's one charity shop I won't be donating to, or visiting again in any hurry. They are forever advertising in their window for donations of this that and the other. It will be their loss and another charity shop's gain.
A blouse, with all its new labels was in the section for my size. I attempted to get into it. As I was in a public area, I tried it on as gracefully as possible. It was very much a manufacturer's wrong sizing, the item was a good size and a half smaller than the labels suggested it was.
I thought I would be helpful and let the staff know the garment appeared to be mis-labelled. The assistant took it as personal criticism and was quite aggressive...rude in fact. Best talk to the boss - who is a paid employee - I decided. She wasn't much better, saying that it was a teens garment. Politely, I replied that if it was the size wouldn't be any different. She waffled some more, till I said, " Look, I do buy this make, and this label size usually fits me". Her reply was that they, the charity shop, could only go by the labels.
Some customer care training is required, methinks.
Bearcub

Sounds like they're employed by the local council...