Absan, how do you know who is a guy and who is a girl?
Everyone agreed that it was okay to meet at a hotel, and that was the main issue.
In terms of clothes, I don’t think it makes much of a difference as long as you aren’t wearing denim and sneakers. But if someone normally wears Shabbos clothes, she shouldn’t think that she is supposed to wear weekday clothes just because he is not picking her up. And if someone is asking already, I think it’s preferable to wear Shabbos clothes on a date.