Communal dressing rooms are rare where I live in Australia.
Typically there are individual stalls with either doors or curtains for privacy. This means you’re never changing with anyone else.
On one occasion, there was a row of male stalls to the left, and female to the right. I was dressed but headed for the male stalls out of habit when the female attendant stopped me and said, “Madam, the ladies change rooms are the other way”.
At least she though I passed!