Free pattern Making Samurai helmet

Hi you guys. This is my first time to make helmet. Obviouly there is room to improve. I am sure you can base on this pattern to modify and make it better. In this video, the leather thickness is 1. 3mm but i highly recommend 1. 8mm to 2. 0mm. 1. 3mm is too thin for helmet. My head size is 57cm and fit this helmet pattern size. Pattern: Etsy: