When Michelle confronts the makers of the snuff films in their hideout she is wearing a long coat and a buttoned dress. However, in the very next scene when the snuff killers turn the tables on her and tie her up, Michelle is stripped, when this happens, it is clear that she is wearing the long coat but no buttoned dress. It was probably done to make the stripping scene quicker without having to remove both the coat and the buttoned dress.
Michelle's hairstyle is different before and after she is tied up by the snuff killers.
When Michelle gets ready to go to the hotel bar, she puts on a black and silver dress. She is also wearing a bra underneath. When she is at the bar, it is a completely black dress and she is wearing no bra underneath.