The Lovers.
At the start of the show, people in the world of the lovers are pure, untouched, and above it all. The adults (Egeus, Theseus, & Hippolyta) have small splashes and notes of color that symbolize how they have been forever changed by their experiences in the world. The young lovers (Lysander, Demetrius, Hermia, and Helena) start the show in all white, having not experienced the whirlwinds and impact of love and chaos. As they continue on their journey, the color bleeds into their clothes and life until they are forever changed by the magic of the fairies.