Hermione cast a charm to bunch the length of her skirt in a knot at calf-length, so she didn’t stumble. Draco did not prefer her to be so covered up. She figured she would get a little torn up and messy before coming home. He would see her and want to undress her, perhaps pull her into the bathtub with him. She would kiss him all over, ask him how the visit to the dungeons had gone.