Just for her:

Consider two outfits. Wear your cute comfy clothes for the first half and bring a fancy dress for the second half! Don't have a fancy dress? Grab a pair of glittery heels or a sparkly cocktail dress for a quick change of pace. Rent the Runway is a great resource if you don't want to purchase a new outfit, or ask to see what I have on hand in my client closet. It's expanding almost daily. 

Long flowy dresses and skirts bring extra movement to photos and always look amazing on camera! Even though it's highly recommended to bring two outfits, don't feel like you have to! Be sure you are comfortable in your outfit and your personality will shine through!