Okay, this does sound a bit extreme:

As the article explains, only children nine and under can dress like princesses, but that's not entirely accurate. For one thing, anyone can wear the ears. Even a guy who looks like a rat. No one's going to take him aside and say "sir, children may confuse you with a trademarked bipedal anthropomorphic rodent." Women can, and do, wear bridal veils and mouse ears, a "bride of Mickey" thing I've never quite gotten. On one hand I hope it's their honeymoon, and on the other I hope it's not.

Anyway, it makes sense, because otherwise half the crowd at Disneyland would be in costume, and if you don't think that would mean immensely fat guys painted blue pretending they're the Genie, you're wrong.