A friend of mine at college was in the habits of wearing bow ties for every semiformal+ occasion. At uni graduation, he wore one with our school colors (purple and gold). I thought that was nice. Given how uncommon bow ties are outside of tuxedo events, wearing one definitely says something about the wearer -- that they have their own sense of style independent of cultural norms, or that they like archaic clothing. The statement depends on the person, I think.