If you are not a fan of wearing garments, this might help you feel comfortable changing over to regular underwear. Garments were originally worn to set polygamist men apart from monogamist men. (Source – Emma Hale Smith Biography, pg 140) Garments were worn by those secretly initiated into plural marriage. The endowment session as we know it did not realize till much later. Also, Joseph Smith was not wearing his garments when he was killed in the Carthage jail.
When I first switched to regular underwear, it felt strange at first, but was also very liberating to wear what I wanted. I never cared for garments and only wore them out of obligation. It angers me that my wife and I wore them for so many years!