A Cloak is piece of clothing worn on the back. It can be dyed various colors. Cloak does not decay.
Use Shears on a Bolt of Wool Cloth to get a Cloak. Using a Needle and Thread on a cloak will make a Long Dress.
To dye, you dip the cloth clothes in Simmering Dye Mordant to make them "dye ready", then dip them in your chosen dye color.