What do I do if I want my girlfriend to wear better clothes.
Why do you want your girlfriend to wear better clothes?
I want her to make a better impression when we go out on dates.
I know you want your girlfriend to wear nicer clothes, but you shouldn't criticize what she wears. It's her choice to wear the clothes that she wants to and it's not for you to decide what she should wear.
Well from what I see, she looks like a homeless person in those clothes.
I understand that you may be embarrased when your girlfriend doesn't dress accordingly. It would be best to take her shopping to try on and pick out some new outfits. This may inspire a different sense of style in her.