​This is the second most popular question after location. What do we wear? It  all depends on you, really. But here are some recommendations.
Keep in mind that you want to stand out, not to blend in with your background. You also want to be the subject, so wearing the right outfit makes you stand out and not your clothing or accessories. 

STYLE
Think about the style you want to go for. Do you want your images to look light and airy? Elegant and Soft? Stunning and alluring? Bright and fun? Dress accordingly! Flowy fabrics and neutral colors give photographs a light feel. Dressing in the same colors but adding a bit more classy fashion into the mix makes the photos more elegant. Dark-colored formal or semi-formal clothing will give an alluring yet elegant vibe to any photoshoot, especially one outdoors.  Brightly colored accessories can make the portraits more laid-back and fun. 

CLOTHING TYPE
Women: Short Dresses, Maxi Dresses, Jeans, Leggings, Skinny Jeans, and a cute blouse. Nothing wrong with a little bit of sequins either!
Men: Button-up shirts, Jeans, khakis, etc.

PATTERNS
Solid color clothing will help keep the focus on you as a subject, especially when there is a lot going on in the background. I would try to stay away from clothing that has words, logos, or graphics on it, unless this is a graduation, work, or school shoot. Patterns aren't always the best for photographs, but sometimes it works with seasonal shoots. A gentle Plaid flannel shirt looks  nice in fall photo shoots.

COLORS
Light, dark, neutral or muted colors all work well to keep the focus on you. Colors like white, cream, light blue, slate, navy, light grey, taupe, ivory, burgundy, and black all photograph very nicely.  For a group portrait, choose one to three colors of similar tone that work well with each other, but don't try to be too matchy-matchy. 

JEWELRY
Jewelry should be minimalistic, you don't want to overdo it and draw the attention away from yourself. Also, jewelry that its too large and reflective makes capturing photos tricky. 

HAIR
If you are planning on getting a haircut or trying out a new hair style, do it at least two weeks before the shoot.  ​​Keep hair simple but pretty. If you like your hair better down, wear it down! 
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NAILS
In any shoot, your nails will show at some point!
Ladies, make sure your nails have a fresh coat of polish on them that hasn't started to chip yet. Neutral colors work best as they will not draw too much attention to your hands or clash with the different outfits you brought. 
Guys, just make sure to clip and clean up your nails and cuticles. 
If you are going for a casual or beach shoot where you will be barefoot, don't neglect your toenails!