Agarn, I don't know why they say you're so dumb.
If you just fold up the brim, it will fold at the line of stitching where the hatband is stitched. Over time, that's going to become "tear along dotted line." If you steam the brim, it'll fold up more easily a little farther away from this weak point.
I don't recall ever reading about this level of hat maintenance from anyone who actually wore the silly thing. Probably because they didn't do it. If they needed a new hat, they got issued one. (They also wore them for months with little quicky repairs. Fred Ray wore his Gettysburg hat, with a great tear where he got hit with a ball, for months after his wounding. I think he replaced it in January 1864.)
Pine River Boys, Co I, 7th Wisconsin
"We're... Christians, what read the Bible and foller what it says about lovin' your enemies and carin' for them what despitefully use you -- that is, after you've downed 'em good and hard."
-Si Klegg and His Pard Shorty