Techlaw Advisor [UPDATE: shuttered], a link to a very smart copyright blog from a member of the firm that cleaned my clock in 1998. The item by Bill Patry, Clothing and Costumes Redux, is surely everything you ever needed to know about whether dressing up in funny costumes is going to be a ticket to federal court, in light of (or despite, as he suggests) two recent decisions. (Oddly, however, he does not address the Barney decision, nor the H.R. Pufnstuf kerfuffle stuff from a few years ago.)
It’s not every day that I say this, but Patry’s blog is one H-E-double-hockey-sticks of a good IP blog, if you’re into that sort of thing (and who isn’t*)? I bookmarked it and you should, too.