This is what's referred to as a poet shirt. Gathered yoke across the front and back shoulder blade area.

100% light weight cotton, 7 button front with a 2" collar.

 Sizes are Lg-Xl-XXl-XXXl, and are as follows:

               Shoulder to shoulder        Chest           Length       Sleeve

Large-                 18"                             up to 54"      29"               33"

Xlarge-                18"                               54 1/2"        29 1/2"         33 1/2"

XXlarge-              18 1/2"                        58"               30"               35"

XXXlarge-            18 1/2"                        60"               30"               36"

 Machine wash cold, drip dry, iron.

Many uses for various period looks from the 18th-19th centuries.