Shampoo, shower gel and facial cleanser that women usually buy have fragrance, and they will also have fragrance when used every day. The smell they gave off when they walked by was probably the smell of some kind of shampoo.
Some women like to wear perfume behind their ears and wrists when they go out. The smell is not strong, but they give off fragrance when they walk. Sweat is also fragrant, and the fragrance can last for several hours.