Bring shirts with a collar as well as different necklines.

Bring at least 6 different tops to choose from.

No sleeveless shirts for headshots, they can make the arms look big and skin below the face takes the attention away from the face.

No solid white.

Solids usually work best, stay away from patterns and busy prints.

Bring a lint brush or lint roller, fuzz will show on dark colors.

Make sure your clothes are pressed and clean - very few photographers have irons or extra time. Photo retouching on soiled clothes will usually cost extra.

Stay away from clothes with big buttons or ornaments that shine and compete for attention.

If you wear earrings they should be small studs. Keep jewelry at a minimum, because anything flashy will distract from you.