They have special underwear that they buy from the church to wear to church. A holy garment like the priests wore. Ya gotta laugh. Underpants?! LOL
Oh dear! I’ve heard it all now!
One little correction, they don’t just wear the magic underwear to church, they wear them ALL the time. When I was Mormon, most LDS women wore their bras OVER them rather than under.
They are referred to as ‘the holy garments of the Priesthood’.
Onyx, I entreat you to learn more.
Historically, UTLM.org cannot be beat
Doctrinally, Mormonoutreach.org and MRM.org as well as IRR.org/mit
For personal stories, exmormon.org is the place to go to get into their mindset.
As always I, and several other ex-mormons here are available to answer questions.
Regarding the ‘magic underwear’ here is probably the best link...
http://www.i4m.com/think/temples/mormon-garments.htm