Well, I believe the answer you were considering is fine. In all likelihood, he wants to get a general impression of how you photograph, and how you look in whatever style and color you had worn. Either pro photos, or facebook images would do.
If you're hesitant to reveal any facebook info/images, simply respond that your site is private.
What you should wear, and clothing changes to bring to the shoot, should be settled with the photographer beforehand, as should any questions about makeup and hair styling.
Good luck; models are a valuable resource, that can make or break an image. :)
A good approach prior to choosing a photographer, is to review their website, to see if they shoot the image style you're looking for. And, of course, have someone, preferably a female friend (to keep the atmosphere relaxed), accompany you.