I needed complete a look that pairs with the fancy Demon Hat of Aiming + Coat of the Lost Thief. And as much as I like the Coat, I didn't think the original sleeves were great - the Torrent Armguards works great as it matches the Coat's shoulder flaps and works as a dyeable sleeve. You can substitute the Elezen Tights with the Expeditioner's Pantalettes; or any pants with patterns, which should work well with the 2B boots.
This look is also great for BRDs!