I noticed the same thing about my attire, done unconsciously. Looked in the closet and dresser and thought, huh. Also black in outer wear and t-shirts. Post September 11, 2001, a lot of American flag and Eagle tees and sweats, always worn to Lowe's and Home Depot, being as I live in a sanctuary city. Last few years though in sub-dued tones. Guess I got that woolly caterpillar effect going.
I do it consciously; on the edge of the Newark Welfare Nursery, we always have to deal with raiding parties looking to loot...