While doing some events in a Sand Storm in Dry Top, I was opening some Buried Lost Chests, I found an Adventurer’s Spectacles. When I looked them up I found that they can be used to craft a better looking Adventurer’s Mantle. I was afraid I would have to grind more chests in Sand Storms or pay a lot of gold to get them, but nope. They are cheap on the Market Board.
As you can see, a set of 3 Specs, and Scarfs doesn’t really cost that much. I guess the drop rate is pretty high from the chests. Also there are the pictures of the Light and Heavy versions. They all look the same actually. These parts are all dye-able.
So you can craft the mantles if you have Tailor, Leatherworker, or Armorsmith at about level 400. Follow the links in the Wiki for crafting instructions and use Discovery for the Recipes.