Draco's smirk faltered somewhat as she ripped his shirt opened. He particularly liked this shirt but he supposed he should have expected rough care towards his clothing. Besides, it wasn't as if he couldn't have his house elves mend it or, better yet, toss it in the bin and buy a new shirt. Still, he disliked being rumpled but he didn't dislike it enough to protest.
As she gazed at him his smirk returned, enjoying the fact that she was looking him over. He didn't for a second think she was repulsed by what she saw - no one was. He was a pretty boy, after all. His features were soft like his mother's and he didn't meet a person yet who found him unattractive.
"If I may say so, Miss Greengrass," Draco said, amusement in his tone. "I could easily conjur you up a collar, but that's entirely up to you, of course."