I made this Iron Musketeer's Helmet for my thingiverse buddy Jim.
https://www.thingiverse.com/JimmyTime/about
I messed up the first time I made it so I decided to split it for him this time.
This was sized to fit an adult male but check dimensions.
http://ffxiclopedia.wikia.com/wiki/Iron_Musketeer%27s_Cuirass_Set