My girlfriend of almost half a year wants to go clubbing with her friends, I have no problem with this but when I asked her what type of clothes she’s going to be wearing she sent me a picture of her club outfit

It was basically A BRA (the third one in the pic) and ripped jeans.

I told her I wouldn’t like her wearing this out especially since I’m not going to be there and there are a lot of guys who will be looking at her, then asked who is she trying to impress, to which she replied “literally no one”.

She’s not the type to cheat but i question why girls wear these type of clothes even though they’re in a relationship

Should I try talking to her again but more firmly?

EDIT: When I last talked to her about this we had a small argument and after she said “I like it when you get protective”