I mention this not to embarrass him further but as a call for a united front of community sensitivity to the issue. It is very difficult not to stare, we all sympathize with that, but let's wait until he goes to sleep in the library before we let fly with the comments on the sunstone. Another good time to voice your observations is when he is running because he has trouble hearing anything over the flapping .
If it is sitting crooked, which seems to happen whenever he moves his head, just matter-of-factly straighten it for him and don't make a fuss. We're all adults. No need to make a fuss.