My girlfriend is wearing clothes that I dislike so I am going to demand that she go home and change.
Would you like to treat your girlfriend that way?
I'll try to cheer her up by wearing sexy clothes
I am kind of confused, you will dress up sexy but tell her that she's not allowed? People are going to think that you are controlling by telling her what to wear and they may even call you childish.
I'm not 'childish'. I'm into slutty clothes!
So why not let her wear what she wants to? There's nothing wrong with dressing however you'd like and people would think she is just expressing herself.