In our style (Kinokawa
and specifically our dojo Aikido Mt. Airy
), we wear hakama as yudansha. This is more of a business thing, though in our case. It is difficult for new students coming into a dojo to figure out who is leading class unless they see the black belt or something that stands out.
We are an independant organization, and don't have many yudansha at our dojo. By wearing hakama, we are easily recognizable when new students come in to join. Since we don't have a large pool of yudansha to work from, our shodan's haven't gotten the big head sometimes associated with yudanship at some other dojos. We've all been humbled at one point or another by our main instructor.