There is no inner tag indicating size but my guess is that it?s a small/medium. This measures 19? across the chest from armpit to armpit and is 26? lengthwise. I typically measure the sleeve from the shoulder but this isn?t showing a line for the shoulder, so, I?m just measuring from the neckline down to the end of the sleeve which is 26.25?. There is a short lining in the interior which is partially frayed on the ends. In good condition otherwise.