I tend to go in cycles of colors. We only go shopping for clothes twice a year, and we get a whole bunch of clothes at once, so I really notice when pick out certain colors. I always pick colors that I know look good on me, but I think most people do that.
I consistently pick out greys, but every season, I somehow end up picking a whole bunch of clothes out in only one or two other colors. One time, it was eggplant purple; another time, raspberry; this past fall/winter, I picked out clothes that were almost exclusively peaches and navy blues; this spring/summer, I’m leaning towards cobalt blue and bright chartreuse.
I think a lot of it has to do with trends in my case, and when I inadvertently choose two colors, I always somehow pick colors that go well together with each other, perhaps with the subconscious intention of wearing them together. But I also don’t have one favorite color- my favorite colors constantly change, and my clothes tend to follow in suit.