Need a Family Halloween Costume Idea this Year? Nothing is More Classic or Fun than the Flintstones! The Flintstones Kids Sized Bamm Bamm Costume Incudes a Headpiece, Fleece Jumpsuit with Attached Feet and Club. Don't just think outside the box for Halloween--blast outside the box with the Flintstones, the classic way to make a family costume statement that's sure to raise eyebrows (and spirits)!