Lands' End Burgundy Check No Iron Supima Popover Long Sleeve Half Button Tunic

Lands' End Burgundy Wine Check No Iron Supima Popover Long Sleeve Half Button Tunic. No size tag but armpit to armpit measures almost 23" and length is 28". Pristine condition. Half button hidden placket. Another one I bought at the same time does have the size tag with same measurements, and it's a size 16. 555