Caubeen is an Irish Beret. It has a raised left side and a slant toward the right side of the wearer’s head, with excess material accumulated on this side. Some versions of Caubeen resemble the French Toque also with folds and the headband.
Caubeen was originally a peasant hat in Ireland and was incorporated by the Irish Army and later on by the other countries’ armies. The hat’s key feature is that it is slightly oversized to the wearer’s head and therefore hangs a lot.
As used in armies, the left raised side showcases the army insignia and sometimes a feather to make the beret look more decorated.