Lidsville
Lidsville was Sid and Marty Krofft's third television show, which aired for two seasons (1971-1973). The show involved a boy named Mark (played by Butch Patrick) who falls into the hat of Merlo the Magician and arrives in Lidsville, a land of living hats. The hats on the show are depicted as having the same occupations as the humans who would normally wear them. For example, a cowboy hat would act like a cowboy. The character's houses were also hat-shaped.
The villain of the show, Hoo-Doo was played by Charles Nelson Reilly. Among other notable characters were Raunchy Rabbit (Sharon Baird), Weenie the Genie (Billie Hayes), and Rah-Rah the football helmet (Jerry Maren).
Lidsville may have been based on an earlier British series, Hattytown Tales, which used an almost identical concept but different characters and was produced in claymation.