Amish Sweat Ritual
When a man in a solid-colored shirt with suspenders on, possibly an Amish man, gets all sweaty from toiling in the fields farming and his shirt is soaked with muddy sweat, either from the dirt that was kicked up when plowing in 95 deg F weather, or from rolling in the crumply soil.
At the end of the movie Witness it looks like the Amish men just got done with an Amish Sweat Ritual.