What would an Obfuscated Perl costume look like? My first thought was affixing slips of paper with "$"s, "@"s and "%"s randomly on one's clothes, but that probably wouldn't compile. Maybe something like the code on the ThinkGeek Perl shirt...?

Another thought: create two bracket shapes out of cardboard tubing, affix them to your sides, wear a shirt with a "=" on it, and go as the spaceship operator.