Ladies
A V nec top or shirt with long or three quarter length sleeves will be the most flattering. If you want to wear a shirt try and have a structured collar. It will sit better than a floaty material.
Have a blazer or jacket to pop on for a different look.
Only wear your normal amount of makeup. I know you may want to go and ave t done and they will be great. Just make sure you look like yourself.
Hair is the same as your a makeup. Have it nice and styled but something that looks like you. If you have picked and outdoor shoot always go for your hair up, off your face and sprayed so it doesn't move. There is nothing worse than liking a photo but there is hair in your face.
Jewellery can make a statement so think about that as you pick your outfit. If its too big or blingy it may distract from you. Go with something understated unless you're looking for a more funky shot.