Hello, fellow Berserk fans! Please check out this series of articles I wrote about the evolution of Guts's armors and costumes. It has loads of explanations and pictures to help artists and cosplayers understand the features of each armor, and references historical armor designs that Miura was inspired by.
You can start reading it at https://azuresberserkblog.blogspot.com/2020/07/a-gude-to-gutss-armors-part-1.html
If you like it, please upvote on reddit too!
https://www.reddit.com/r/Berserk/comments/1hjeyo5/a_guide_to_gutss_armors_part_24_the_berserker/