linothorax and other white cuirases

[Dan Howard]

.Aldrete has mention in his experiments that when the armour was heated and gets more elastic also was more dificult to penetrate.

There is only one way that makes possible to create a musculata armour wth flexible shoulders, and this will be with glue and linen in a mold, - using the right glue..

There is no way to make a musculata with flexible shoulders. The only option is to make it so thin that it no longer functions as armour. Try it and see. You'll end up with a Hollywood costume, not something that is of use in battle.