What do you wear to an apartment party?

Ka

I know I’m overthinking this but I’m in college and usually I go to frat parties but I’m going to an apartment party with a frat.

Is it more casual than a normal frat party? I feel like frats you try to be super sexy, but I was wondering if it would be acceptable to be casual sexy.

I’m clueless on stuff like this, thanks for the help!