"These old trousers are threadbare in spots, but they're surprisingly comfortable. The legs are a bit short, though."
--In-Game DescriptionThe Well-Worn Trousers are leg armor that appears in The Legend of Zelda: Breath of the Wild. Link can find it, along with the Old Shirt, in a treasure chest in the Shrine of Resurrection immediately after awakening from his one-hundred year slumber. It's part of the Worn Set and has a defense of 1 when worn by itself.
The Well-Worn Trousers can be found in a treasure chest in the Shrine of Resurrection immediately after starting the game for the first time, along with the Old Shirt.