He looks at her and sees that she is addressing his words rather slowly like if she is trying to make time. So he says "Well if you can't wear what i picked out for you then might as well go in what you have own right now." the choice is up to you but i was only trying to make things better for you and I'm sure  you don;t want people or your friends to ask why do you smell like sex. It didn't matter to him and he had more planned for her. So he says quit stalling all ready slave because if your late i might need to give you a spanking with this brush and give you something different to wear beside panties.