I am not saying she wouldn't leave the house in sweats. But her brother said that MB had a boyfriend. So Hailey would have expected to hang out with boys that night, imo. I think she would have wanted to look good. I see pictures of her looking cute, with nice outfits and make up on. It was Christmas break, and I think she would have had money and a hoodie and some jeans, imo.
Yes, but her father also described her as something of a tomboy, so not dressing up to impress boys, especially if it was for a casual get together, would not be unexpected or out of character.