Choose several complimenting colors. Pick some of your hues that coordinate well together and stick to them. What are your family’s favorite colors? Don’t choose one color for the whole family- multiple colors will add dimension to your images.
Pick one pattern and go from there. Avoid dressing the whole family in patterns. A good idea is to choose one item, a dress for example, with a pattern containing the colors you love. Then choose colors from the item that you love for the other family members to wear.
Be comfortable. Make sure that everyone’s clothing fits properly and is weather appropriate. If you’re hot or cold during your session it’s less likely that you’ll appear happy and relaxed in your photos. This is especially true for children. If you feel good in your clothes, it shows!