This jacket is a Black Fleece jacket by Thom Brown. It is vintage jacket and was part of Brooks Brothers collaboration with Thom Brown. It is beautifully tailored, and new, without tags. It doesn’t have a label but it is Thom Brown, the quality is outstanding.
It was a sample but it is probably a size 6 to a small 8. The measurements are as follows:
About 17 inches underarm to underarm.
23 1/2 from top to bottom
19 inches from underarm to bottom of sleeve