Clean seems to be the way to go these days, but I'd say fie on popularity and go with what Vimes said: whatever you want. Except caveman. Never go caveman except in November.
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Want to help create a US anime convention map?
COSPLAYS IN PROGRESS
Canterbury (Kuroshitsuji) - 30% - Kuro Gathering
Utatane Piko - default (Vocaloid) - 15% - Ohayocon
Boris (Alice in the Country of Hearts) - 3%
Jean (Shingeki no Kyojin) - 0%