
Youre his girlfriend. Whos capable of making her own decisions. Do not ever settle for insecurity at the hands of someone who tries to control what youre wearing because theyre too afraid to say that they don’t want to lose you. Ask him why he feels that way. Distance his reason from him. I can understand the competition aspect of it, but if hes secure in knowing that you have his heart, then I personally wouldn’t care what you wear unless it’s over the top self-disrespectful.
And he should absolutely not be directing that at you. A lot of guys will see the risks that women face and feel a desire to protect and a feeling of guilt by association/complacence that they end up directing at the women in their lives they are worried about. Which isnt okay nor does it make it not hurt even if it comes from a place of well intentions (your safety)
My question for him would be why is that a bad thing? If it’s about male attention, then it’s either a trust issue he has with you or a doubt in himself to stand up for you. Safety is one thing but forbidding (or suggesting it be forbidden) someone from wearing clothes they have always worn and enjoyed is very controlling and imo is a red flag for unresolved insecurity.