White as a light source, white as a dye, and white as an object are all colors perceived by the diffuse reflection of the sun, and are the furthest from black.
The color of the costume is off-white, not pure white, to express the nuance of "far away but not too far away.
Also, the relationship with the "sun," which is indispensable in recognizing "white," is also included, as well as the irony that society and humans are inseparable, and that modern society (a diverse society) is black (distant).