Most of the time dressed up works for me. If you are the pretty/beautiful/gorgeous type then sweats can work a little more often. I can give you an example of the other extreme. I once worked with a homely looking girl, but she outdressed her female colleagues; makeup was always perfect; she was self confident; very competent on the job; and friendly -- as a result, she always looked better than she looked. I imagine she would have looked terrible in sweats and a tee.
Not sweats. But I do think a girl can be very attractive in just jeans and a tee. If it looks like someone is trying too hard (like tight clothes, high heels, lots of makeup) then I think that can be less attractive than just being natural and comfortable.
Dressed up for sure! Sweats are NEVER the best look for a girl. A really hot one can pull off looking great in sweat pants and a tight tee (especially braless) but it's probably not the best look for her.
When dressed-up, of course!
I remember weddings and the time when school ended, each and every girl was dressed-up so well and damn I couldn't take my eyes off them.. even those who normally are average were looking stellar!
If a girl is born pretty, she of course won't look bad in sweats and a tee, but definitely not better than dressed-up!
As long as you're not trying to pull off the "leggings/tights as pants" thing. I'm fine. Nothing worse than a girl who thinks tights and legging are a substitute for pants
sweats and a tee are cute but dressed up for a club is sexy dressed up for a wedding or party is pretty