How does the church know what you are wearing underneath your clothes - and would you listen to a religion which tells you what to wear?

https://www.yahoo.com/news/among-mormon-women-frank-talk-121434693.html
Among Mormon Women, Frank Talk About Sacred Underclothes

Sasha Piton was on a hike near her home in Idaho Falls, Idaho, when she realized something was wrong. The trek was just a few miles, and not strenuous, but a rash was spreading along the crease above her thigh.

Piton quickly identified the cause. Like many members of the Church of Jesus Christ of Latter-day Saints, she wears a white two-piece set of sacred temple garments, which are functionally underwear, almost all of the time.

After another painful hike, Piton reluctantly stopped wearing the garments when exercising and occasionally removed them overnight. Both changes felt significant, since church members have historically been encouraged to wear the garments “night and day.” But they were simply too uncomfortable.
How does the church know what you are wearing underneath your clothes - and would you listen to a religion which tells you what to wear?
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