"Fornication pants."

That's a term coined in the 1830s by Brigham Young, who was appalled by pants with buttons visible on the fly. The reminder that pants can be taken off might inflame the passions, because otherwise, you could just forget that clothes are not permanently connected to the body.

Most of the linked article is not fashion, religion, and history. It's present day opinion about blue jeans, like:

I’m especially confused by a style I have lately seen with alarming frequency: the fronts of the legs are light and the inner thighs tinted much darker, giving the wearer not the intended lean-thighed look, but the appearance of someone who is blissfully unaware that she has lost control of her bladder.