Mother of pearl buttons, great lining... all of the details you expect from Mr. Browne + Brooks Brothers.
I tried it on, it fit perfectly, and I knew I was buying it... fantastic tailoring, it has a strong shoulder seam, and high armholes, plus the back is pinned just enough that it doesn't billow. Perfect.
Here it is from the Black Fleece site:
Of course I wore it the very next day... paired with a navy, white, and red striped tie. I liked the result!