I like this next one even better than the one that Phoenix is sporting. Definitely mare apparel, though.
You can find these 2, among others, at SSTack.com. Horse.com also has some really cute ones, including crossed eyes with a fly or butterfly on the nose.
I still haven't gotten used to seeing Phoenix with his on and every time he turns toward me it catches me off guard and I have a good laugh. I'm laughing WITH you Phoenix, not AT you... really!