This is a gorgeous shirt from Orvis.

Made in Portugal of an exquisite blend of cotton and wool, it's a brownish-green (I'd call it heather) plaid.

The shirt has a button-down collar with hidden tabs, single-button barrel cuffs, a left chest pocket and a squarish tail. 

This beautiful shirt is in absolutely MINT condition.  It looks and feels like it's never been worn. It is guaranteed to be authentic and absolutely perfect.

  Marked M. 

The neck measures 16 inches from button to button hole.

 The sleeve length is 35/36 inches from mid-collar to the end of the cuff. 

Across the back, laid flat, the shirt measures 23 inches armpit to armpit and 33 inches from the collar seam to the bottom of the back tail.