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Capcom Heroes - Visit Slappy's Fun Shack and Party Poppers in the Mall as Adam.

[Buggy/Missable].

See "Full Wardrobe" for info on how to unlock the costume. The rest is self-explanatory. Slappy's Fun Shack is in the northwest corner of Miami Boardwalk, while Party Poppers is in the hallway just outside the north exit from the Amazon Food Court.

The reason this is buggy is if you visited the two stores before getting the costume, the achievement won't pop until you visit an undiscovered location while wearing it. If you've already discovered everything, you'll have to start a new game.