Preparing For Professional Headshots

Clothing

Solid colors look great in head shots.
If going with a pattern keep it simple.
Clothing should be fitted. Baggy or loose clothing could look sloppy on camera. Make sure jackets are not too tight and create wrinkles.
Start with a simple shirt or blouse and slowly add layers.
Once you choose your outfit sit in front of a mirror and see if your clothing creates wrinkles or bunches up. Try out several different poses with your arms and body angle and see how your clothing reacts.
You may want to bring a couple of clothing choices with you just in case.
Make sure that ALL clothes are ironed before the shoot. Wrinkles in clothes are difficult to edit out and could require additional fees if editing is possible.
If you have pets or your clothing collects lint bring a lint brush or roller with you.

Hair should be free of frizz as much as possible. Consider using a lot of hairspray to keep hair in place.
Wear makeup as you would wear it to work. If you don't wear makeup I strongly suggest wearing foundation or powder, blush or bronze and mascara. I would also bring along lip gloss.
If your lips are chapped do not wear lipstick. You can help prevent chapped lips by drinking plenty of water several days before, avoid Chap stick, but do put a generous amount of Vaseline on your lips each night before bed. Use a sugar scrub daily to remove peeling skin.