Hi T., I was just searching online and found a website that rents costumes like what you are thinking about. They are out of state and charge for shipping so maybe if you do a little more searching online or call a local costume shop near you, they may be able to help you also. The website I found is called costumeholidayhouse.com. The Donald Duck costume is really cute. Even though someone said they are licenced charactors, the costume shops will rent them under different names. When my son was 2 (10 years ago) we had a Barney party for him. I rented a "Purple Dinasour" that looked like Barney and my son loved it!
Good luck with your search, I am sure you will find something you like.
N.
Mom of three great kids, Ryan 12, Troy 9 & Audrey 3. Wife to an awesome husband for the last 18 years.