This is a gorgeous trench coat from Brooks Brothers.

Made in the USA of a cotton and poly poplin blend, it is gray.

The coat is double-breasted and has a plaid  zip-out lining with silk batting, a belt with leather buckle, a rear vent, epaulets, and belted cuffs. 

This coat is in absolutely PRISTINE, MINT condition. There is a small laundry mark near the label (see pic). It is guaranteed to be authentic and absolutely perfect. 

Marked 40 and meant to fit over your size 40 suit or sport coat.

It measures 23 inches armpit to armpit, 34/35 inches from mid-collar to the end of the cuff, and 46 1/2 inches from the collar seam to the bottom of the back. (All measurements done across the back with the jacket laid flat). 

Please compare my measurements with a coat you have that fits you well.  You will NOT be disappointed.