My girlfriend sometimes wears this when we go out to bars / night parties. Is it inappropriate?

I think the suit sexy. We have dated a few months. But I feel also bothered because I put low effort into my looks. I wear jeans and hoodies. And her outfit looks very uncomfortable. And I don't want other guys to stare.

My girlfriend sometimes wears this when we go out to bars / night parties. Is it inappropriate?
My girlfriend sometimes wears this when we go out to bars / night parties. Is it inappropriate?
My girlfriend sometimes wears this when we go out to bars / night parties. Is it inappropriate?
My girlfriend sometimes wears this when we go out to bars / night parties. Is it inappropriate?
Post Opinion