No, it's not too early! Those of us having to sew costumes are starting on them now.
My daughter wants to be a ballerina, a butterfly, and a fish. At once. Any gentle suggestions to the contrary result in trembling chin and big tears. She's three, she wants to be three things, and she wants them all at the same time.
I actually think I worked out a costume that will fulfill her requirements. Next year she'll be a year older and more open to negotiation, right? :rolleyes
Meanwhile, I'll be lucky if I wear a funny hat. I have a death robe I throw on whenever I don't have a costume, but come on, not very fun or sexy. What are you going to be for Halloween?