[He can't help it: the mention of the fig leaf makes him laugh. To his credit, he does his best to hastily cover his mouth to try and stifle it--but yup: definitely laughing at you, missy. Not unkindly, but still...laughing.

When the chuckles subside, Derek still doesn't bother to cover himself, but finally gives up on being a smartass.]

I'd be happy to put some clothes on, I've just--sort of lost track of them. [He sobers a little, absently running a hand over his beard.] I could, uh...cover up, in a way? But if I do, you're probably going to use that blade and bullet. Least that's my experience with hunters like you.

[He pauses to openly look her over with a raised eyebrow.]

Even if you do look like something out of the Regency era section of my high school World History book.