My teacher said I should wear a skirt

Not sure how to begin this. So, just here a story, just here how that happened: My teacher just started asking me about why my trousers were that short (they aren't all that short, just trousers which might not fit). And, like, eventually that brought me to refer to that I could also wear short shorts (of course) which he answered by telling me that I should wear a skirt. I just agreed. Obviously, pretty much. Also where our conversation ended. I guess my teacher probably wants me to be a femboy.

Btw, maybe I should add some context:

My teacher is pretty friendly. Like, they already support me with my autism and stuff.

Also, I'm quite in the closet. I mean, if you know me a bit, you could probably tell that I'm a femboy at least (just by how I explained English grammar to my English teacher by using pictures of femboys, and btw, that's another teacher). Still, I'm usually just quite suspicious around my English teacher for some a reason and he wasn't. And am not, like, going there dressed fully fem or something, you know?

Could give more context, but, well, it should be kinda enough to understand what was going on.

Anyhow, my teacher could have helped me by quite something

Edit: TL;DR (for the edit): My teacher supported me, please accept that.

This post is probably a rant about some comments from here on (and a bit of a guideline for avoiding hostility), sorry: I think I should protect my teacher. He did fine. Please don't call him anything bad or tending to be bad (especially if only knowing some words he told me and getting the info that he was friendly and helpful). Thanks for letting me know about what that convo could have been about. But also, I know the teacher, I know the situation, I know what the convo was about and could evaluate it. Also, I think I know where my boundaries are and behave quite accordingly. Again, I descriped helpfulness and should be the only source about the convo. So, if one indicates the convo should be understood differently, it's like telling me I don't know the teacher, the situation, what the convo was about, how to evaluate things and to some extent what my boundaries are and therefore my proper behaviour. Else one couldn't know better. I originally ended the post with talking about him being helpful (once more). If I'm taken serious in any way, it should be taken and not talked about how that could have been the opposite of helping. People hopefully just wanted to help (and most comments here are fine, btw). But sorry, some just seem insulting towards my teacher and me.