It is important to choose only one or two theme colors, with your subjects wearing shades of those colors. While blues are excellent all year, white, ivory, khaki and salmon are great against such lush green foliage. Burgundy, brown, tan, and gray are nice late in the season. Avoid all greens, as they clash with Mother Nature. Simplicity of two colors helps separate family from the scenery.
Light colors are best with light backgrounds and fair complexions.
Darker colors look better with deep backgrounds and dark hair or complexions. White, ivory, khaki, or pastels are best with a white background. Avoid wearing yellow or green as they can adversely affect skin color. Shoes or socks should be in key. Teens and adults should wear long sleeves to cover elbows.