The Extra Identification episode will allow you to match the different costumes in the series to the anime series they are from.

Meet Chako and her friends from the Cosplay Association at East Oizuki Academy! They're the hottest new cosplay team in Japan...fresh from a winning streak of local battles, they're set to sweep the Cosplay World Series! 
Yeah, right. 
In reality, Chako and her friends are barely able to keep their club alive at all. Feeble club membership and a lack of sponsorship might be the end of their cosplay dreams before they can even start. But don't you dare underestimate this group of spunky girls! They'll survive a barrage of pervy newcomers, cosplay rivalries, costume disasters and dating mishaps in order to reach their ultimate goal of competing in the World Series. The clothing flies as the girls suit up (and strip down) for Cosplay Complex! 
(Source: DVD Back Cover)

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