The 14th century Great Helm was designed to fit over the top of a simple bascinet or cervelliere helmet, giving you double the helmety protection! This helmet has been based on a Great Helm on display at the Royal Armouries, Leeds (inventory no. 600).
All of my helmets are custom fitted so when ordering a helmet I would need to get some measurements off you. Once I have received an order I will contact you to get the necessary measurements:
Width of head (ear to ear) using calipers
Length of head (front to back) using calipers
Eye height (from top of head to centre of eye)
Top of head to top of shoulder