https://en.wikipedia.org/wiki/Poet_shirt
A poet shirt (also known as a poet blouse or pirate shirt) is a type of shirt made as a loose-fitting blouse with full bishop sleeves, usually decorated with large frills on the front and on the cuffs. Typically, it has a laced-up V-neck opening, designed to pull over the head, but can have a full-length opening fastened by buttons. The collar may be standing or folded over with points.