Disclaimer for all, Mormons do not believe in magic underwear.<quoted text>Yes, don't get your magic underwear in a bunch, the whole post was a joke.
Our temple related undergarments are used to remind us of covenants that we made with our Father in Heaven. They also remind us to remain modest. They are representative of the skins made for Adam and Eve to hide their nakedness.
Any reference to magic underwear is just an attempt to make Mormons look stupid.