And all wearing the same kind of special undies.
The "special undies" are a very meaningful reminder of obligations to one's God and one's spouse. Removal of the "special undies" is one last high barrier on the road to sin, a very serious act that should give pause to anyone thinking of committing adultery.
I'm not Mormon, by the way, but I think making fun of their "special undies" is not much different from making fun of a Jew's yarmulke, or a Sikh's turban, or a Catholic's rosary. It's not funny and does not honor God.