A white midi dress combines the formality of both the color and the length for a genuinely elegant graduation option. Midi length in white reads as intentional and sophisticated. The length gives you coverage and elegance without requiring a full formal gown. White in midi length works beautifully for outdoor ceremonies and photographs exceptionally well. A well-fitted white midi dress in a good fabric is the dress you will be happy about in photos years later. These white midi dresses work because the combination of color and length creates a complete polished look.