The girl that walks into the store is dressed inappropriately, she is wearing "a bathing suit with a little nubble over it" and "the straps were down". "They were off her shoulders looped loose around the cool tops of her arms" which states that she needed more coverage over her body. She was walking down an aisle people where staring at her because of her clothing.
People around there do not dress like that. They usually have full coverage and have no skin showing. She was obviously the odd ball out, because of her inappropriate dress wear. She possibly have just came from