The monochrome of all materials provide in focus viewing the whole volume of the house to emphasize its plastic of facade and the structure of various materials.
While her boss, Sylvie (Philippine Leroy-Beaulieu), is dressed in a constant black monochrome, Collins opts for graphic or bright pieces, complete with a matching beret and ankle boots.
This sort of represents, kind of, his religious world view but it also represents that fact that he's trying to drag Kimmy back to a world of monochrome.