hmmm, i was under the impression, right or wrong, that items that are sold publicly can be used at the buyers discretion. It's not like you are dressing as ronald mcdonald and going out and representing Mcdonalds.
So if i wore my Captain America costume for a birthday party, i am not representing Marvel comics.
Same to be applied for any clown, princess or other type of character. Once made available to the public for consumption and not used to represent the creator, you should be good.
However, i have been proven to be wrong a time or 2 and i am open to discussion. My wife taught me that. :lol