I think I should start out by saying I am not a fashion expert! However, I do know what photographs well (or doesn't!).
Your clothing choices should be a reflection of your personal style. You should feel confident in what you wear. If you're uncomfortable or worried about your clothing you will look uncomfortable and worried in your photos.
You should also consider your home decor and colors. Your photos will be hanging on your walls so you will want them to compliment your decor and color scheme.
I recommend choosing 2-3 colors and carry that color scheme throughout the outfits so everything looks nice together, but doesn't match. I find that mixing light colored neutrals with an accent color looks really nice. Adding layers and textures in your outfits always looks great.
I would start with mom's outfit first and choose everyone else's clothing to match moms. So maybe a beautiful floral dress for mom and use the colors in her floral dress to determine everyone else's clothes. Or if mom chooses a solid colored outfit then dad or one of the children could have a pattern in their outfit. (Be careful of mixing too much pattern though.)
Also, keep in mind your location. You don't want to blend in to the background.
Your clothing should be unwrinkled and fit well. Clothing that is bulky might not look flattering.
The following is some do's and don'ts:
Don't wear clothing that is too trendy and will look outdated soon. I recommend choosing classic, neutral, and pastel colors.
Don't wear logos and characters in your clothing.
Do accessorize! Add floppy hats, scarves, floral crowns, bow ties, suspenders, knee socks, etc...
Do remember your shoe choices! Your shoes will show up in the photos.
Maybe- Getting your hair and makeup done professionally is a splurge that you won't regret.
Do make sure your fingernail polish is not chipped and get a pedicure if your feet will be showing.
Do remove hair ties from your wrists and phones from your pockets before your session.
Here's a list of some things you might want to bring along:
*Bug spray for outdoor sessions
*Favorite toys for small children. Also, a treat at the end of the photo session can be very motivating for some children.
*Extra clothes for little ones just in case
I hope you find this information helpful! If you have anything to add let me know :)
Check out my Instagram feed for inspiration from past client's outfits.