We were in there browsing and a couple came in and asked that question! We didn't get the joke as Maria and them started laughing. I bought two lovely dresses from her. It's a very nice shop.
Many years ago, maybe 10 years, I asked the question "do you sell banana liqueur" thinking that she might, she said she didn't.
Every year since then on my first visit to the shop I have always asked the same question, usually before she sees me, of course she knows who it is straight away.
If anyone else comes into the shop and asks that question she says "I know who you have been talking to"
About 3 years ago a brought over a miniature bottle of banana liqueur for her. She now calls me "the banana man"
As you say it is a lovely shop and we use it every day.