Girlfriend dresses to show off her body?

So, I went out with my girlfriend the other day, and she decided to wear these leggings which really accentuated her booty, like, it made her ass look incredible. I don't know if those leggings were made for public, but it was kinda like those leggings you see instagram models wear and it makes their ass POP. I'm not usually a jealous guy, but wow, so many guys were definitely checking her ass out. To be fair, she does naturally have a big booty... so..

Should I talk to her about this or just let her wear what she wants?
Girlfriend dresses to show off her body?
Post Opinion