I'm trying to remember and we've been there twice in the last 3 years. Yikes! Apparently not enough people wore them to stand out in my mind. A lot of people wore flowers pinned behind their ears. You get one free in your room. Then my girls wanted some, so we bought more at a little store on the North Shore. I saw a lot of leis and swimsuits. ;-) In my opinion, there was a much stronger Hawaiian theme in the resort and among the guests than specifically Disney. Not sure I'm describing that well...
Characters are much more subtle at Aulani than in the parks.
ETA: But you should really do what you want to do! If those ears would bring you joy - go for it. I don't think you'd be out of place at the resort.