This is an amazing vintage sport coat.
There is no name and no fabric label. It is made of what I believe is a cotton-poly poplin. It is light, light tan with a plaid featuring green, yellow and blues.
The jacket has a two-button front, center vent, and front flap pockets.
I believe this jacket is from the 1970s and it is in absolutely NEW condition. Never been worn and absolutely perfect.
All measurements done across the back with the jacket laid flat.
Compare my measurements with a jacket you have that fits you well. Even new and unworn items may have been altered. You will NOT be disappointed.