(n) - common slang term for the sacred underwear that Mormons (Church of Latter Day Saints) wear underneath all their clothes as a symbolism of their commitment to God. Plain usually white underwear like a T-shirt & boxer shorts adorned with 4 symbols. For ladies it means generally wearing the vestments underneath their bras and panties. The garments can only be purchased from an official Mormon store.
Mitt's suit always looks so ill fitted because he wears those magic underpants under his shirt and pants.