To get secret costumes, you'll have to smash something in a certain level. To get that character's costume though, you need to smash the level with that character. Tom the Cat:
Cowboy Kitty, found in Unfurgiven
Muskateer, found in Luncheons and Dragons
Beach-Trunks, found in PAWS
Sailor Scout, found in That Sinking Feline
Jerry the Mouse:
Mousekateer, found in Luncheons and Dragons
Snow Parka, found in Snow Fight
Beach-Trunks, found in PAWS
Sailor Scout, found in That Skinking Feline
Spike the BullDog:
DevilDog, found in Scrapyard Scrape
SherriffSpike, found in Unfurgiven
Butch the Cat:
Beach-Trunks, found in PAWS
Auto Scrubs, found in Scrapyard Scrape
Nibbles the Mouse:
Mousekateer, found in Luncheons and Dragons
Indian-Chief, found in Unfurgiven
Duckling:
Snow Parka, found in Snow Fight
Coon'Skin Cap, found in Unfurgiven
