My girlfriend dresses ok for a girl, but I would like her to dress more feminine. That my sound fucked up, but I'm pretty shallow, and I feel that's the one thing stopping me from being super attracted to her. She is awesome in every single other way.

She typically wears a regular T-shirt, maybe a T-shirt V-neck. Something even similar to what I would wear. I'd like her to wear more dresses, heels, yoga pants, etc.

How can I get her to wear sexier, more feminine clothing?