Most Helpful Guy
I would think that's cute, but I'm a naturey type. I like it when girls wear things that are a little out of the ordinary with their outfits like a flower or feather. I personally wear a shoelace as a necklace and for some reason dudes think I'm some sort of badass; so to each their own.
More importantly: You should do what you want. People out there will think the feather is cool; if those are the type of people you want to have the potential to attract then go for it.