Federal officers Commercial Blouse in a size 42. The way these coats are, however, I believe it could fit up to a 48 or even a 50, it is really large. Here is the information off of Mr. Sekela's website.
New they sell for $450, but I would like to get $325 out of this, shipping included. I can email pictures of the coat to anyone that would like if you email me at email@example.com.