The school's policy says there is to be no "wearing of messages, signs, markings, stringers and ribbons on caps and gowns." However, one has to wonder about this because if Bird argues that the feathers are a mark of his spirituality, then you could find a case for religious discrimination if students of other faiths are allowed to wear symbols of their own religions. There are over ten thousand Native American students in the Robeson County school system, so whatever decision is reached could have some wide ramifications. Personally, I think if a kid has worked hard enough to earn a diploma, he should be allowed to wear a feather, a pin, or even a pair of deelybobbers as long as it doesn't interfere with any other student's ability to graduate.
And really, haven't the Native Americans had enough things taken away from them? Do we really need to take this too? Let the kid wear his feather -- he's earned it, and he should be allowed to wear it with honor.