I was once inside a ML in a shop. The door knocked and mamasan told her there was a client wanted to view her.

she pulled out and put on a dress without the undie and went out. A few minutes later she was back and told me the customer would come back half an hour.

Well that's the way a Chinese shop operated with reduced staff. There was only her and mamasan in the shop.

I didn't get a discount and hadn't gone back to that shop again.