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Capcom Heroes - Complete an investigation using the Sissel Costume.

Investigations occur at various points throughout the story. Once you've unlocked Sissel (see "Full Wardrobe" for info on that), just make sure you're wearing that costume when you do an investigation.

One easy way to do this is during the chapter 3 main story quest "Hunting the Monster," since you'll go to the North Peak safe house (where you buy the costume) just before you do the investigation, and there's an arcade machine where you can change costumes right next to the investigation itself. If you miss that, another easy way to do this is to reload case 1 and proceed until you clear out the mall safe house; once that's done, activate the Sissel costume from the arcade machine inside, then do the investigation.