@Dan - Right now there are 4 pairs of eyes and two hats.
If they had each hat with each color eye as it's own icon...that would be four hats of brown and four of black ...only two more than what is there....but what is there is still less XD

I think it was this way during the event because I remember trying to equip the red eyed hat and I couldn't find it and I thought it just wasn't working - but the eyes were blending into the background I had on...XD