A man wearing a kurta? would they be fined?
If he's in the ladies'? Yes.
A woman wearing a ball cap and boots- would she be fined?
If she's in the men's? Yes. (But why would she go in there anyway? )
If a man is a bit effeminate looking, would someone try and fine them?
If he's in the ladies'? Yes. Being effeminate looking doesn't make him a woman.
What about masculine looking women?
What about them? They're still women.
Or a teenage boy wearing nail varnish? Or experimenting with hair colour?
What about a teenage girl who is happy being a girl, but prefers to wear ‘boys’ clothes?
They use the correct spaces for their sex. All of them . However they look. Why are you finding this so difficult to understand?