You might want to mix a casual set with a dressier version. We have an iron here for light touchups. Textures are important in black and white. When doing color, think about the colors and how they match your moods. Groups wearing varied outfits should be conscious of combining colors that work well together.
Same principle applies to hair keep it natural, normal.
DO NOT gct a haircut too close to the shoot unless you totally trust your hairdresser not to take too much off. The point is to make this look like YOU, not somebody else. Bring in any photos of other people you especially like. These can be publicity or personal shots, magazine or CD covers anything. We can use them for reference and build on their ideas.