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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PM me your local conventions to add to the map
COSPLAYS IN PROGRESS
Soren (Fire Emblem Radiant Dawn) - 4%
Vaati (LoZ Minish Cap) - 2%