I often get asked what to wear for your photo shoot. My first response will always be wear what you are comfortable in and make sure it is something that you would normally wear on a day to day basis. But do keep in mind the color scheme and pattern.
I am not a fan of matchy-matchy...so many families want everyone to wear the same outfit...what makes the image stand out more is blending the outfits..
...Here is an example of a good color scheme for a family photo shoot.
For more ideas of wardrobe please visit my blog under what to wear.