It can be changed into double eyepatches by having Patchy on Mos Le'Harmless sew a left eyepatch and a right eyepatch together. A pirate hat and eyepatch can also be made by having Patchy sew a left eyepatch and a pirate hat together. The left eyepatch can be difficult to come across; you may have to loot 50 or more Pirate impling jars to get one.