I sort of get it. It's not unusual to feel uncomfortable when your partners broadcasting their body to people. Guys know what other guys are like so he knows there's people checking you out, It's not really insecurity it's just uncomfortable. It's like if girls were checking out your boyfriend in front of you, you know he's faithful but you still don't like it. So it's not you, it's other people he's annoyed about probably.

Still, he should just say it instead of being passive about it, probably bothers him but he doesn't want to make trouble.
Just my 2 cents anyway.

hes trying to control you, dont let him, wear what ever you want, freedomis very importantin a relationship

Responding to your question (rather than your specific example about clothes and your boyfriend), I was going to make the wisecrack, "I think that's the definition of marriage!" Then I read on, and I was not at all surprised to see the word "boyfriend" show up! 😅

You wouldn't believe what I've been through in that regard. I've actually had a live in boyfriend pick a fight and walk out on me on VALENTINE'S DAY because my red dress was too sexy. Of course, he picked the fight about something else, but he made sure I have no joy on Valentine's Day ever again.

Don't get me started about the 3rd ex.

Wear what you are comfortable with. Never change to please him as he wants to control you.

That’s unfortunate

might be time to part ways with him.

May be because he cares about you

Not like that. I’d be more offended at their attempts to control me in that scenario.