You can go bright or neutral, warm or cool, so many options! I like to see what works in photos and think about your location and "look" for your shoot. Here are some color schemes that I loved...maybe some will inspire you.
Layer, Layer, Layer
Layers and texture look great in a photo. As with all design principals you apply when decorating your home, texture looks fabulous in photos! J Crew and Crew Cuts are great places to seek inspiration when deciding what to wear. By adding a blazer or fun scarf, not only does it make the picture look more complete, you can drop the layers toward the end of the shoot for a completely different look. The best news is layers are very in right now, so it won't be hard for you to achieve this look!
Have a Wild Card
I always tell my clients to have someone be the stand out "wild card" in the photos. I like picking a fun, crazy pattern like an animal print or hounds tooth cardigan. You can also have that "wildcard" wear the accent color as their main color. It mixes things up and can pull an entire look together.
(the pop of pink is the wild card here) (neutrals with a pop of green)
eutrals look beautiful in their own way, just please DON"T do all white or all black. Here are some example more neutral palettes, you can play more with textures, style and patterns to spice it up!
When in Doubt, Ask!
It's important to let your photographer be a part of the whole process with you. Let them get excited with you and help plan your vision. When they know what you are wearing and understand the feel you are going for (casual, fun, formal, etc.), it will make the picture come together beautifully. It's important to pick a photographer whose style you like. Each photographer has a different style. When you can match that that style with your own, you will love the outcome.