Denham combines a WW2-style medic's coat and a Donkey Jacket to create the Medic Union. A little history on the "Donkey Jacket" from Denham:
"Contrary to the myth the jacket wasn't named "donkey work", the more likely explanation lies in the jacket's invention by John Key in the late 1800's, who developed a waxed cotton garment based on the existing Melton coats for the Manchester Ship Canal Co. who wanted a hard wearing woolen coat for the drivers of the donkey engines which towed ships up an down the waterway. The waxed cotton shoulders later became the leather and then PVC. For longshoreman carrying wet timber on their shoulders, the PVC prevented the moisture from soaking into the melton wool body of the jacket."