Some TMNT stuff was always meant for grownups.
Don't Judge a Book... is an 8-page comic originally published in November 1985 in Teenage Mutant Ninja Turtles & Other Strangeness by Palladium Books. Palladium RPG characters and scenarios are not officially part of the Mirage TMNT continuity, but this comic is considered part of the Mirage TMNT continuity because it was written by Mirage Studios staff. It was later reprinted in Shell Shock.
The turtles are preparing to go to a Halloween party, and happy about for once being able to interact with people out in public. Outside four goons are under the impression that a rich old lady lives above the Second Time Around shop, and plans to rob her. They break in, but are attacked by the disguised turtles. During the fight their costumes are ruined, so they end up going to the party wearing their usual belts and bandannas, successfully hiding in plain sight.