The surcoat was weared on the armor. The goal was first to protect it from the sun - especially during the crusades - iron becoming quite quickly burning hot. It also allowed allow the fighter to be identified trough his colors, in this case the Hospitallers knight order.
Our replicas are made of cotton fabric, have an inner doubling, and are open at leg's level, to allow the wearer to move freely. The size is L/XL, to be adjusted with laces on the sides. Several different colors are available.