This is a gorgeous shirt from Anchor In.

Made of 100% cotton, it's a red, white and blue plaid.

The shirt has a button-down collar, 2-button cuffs, two chest pockets with flaps, a slimmish fit, and a squarish tail.

This shirt is NEW, with tags. It is guaranteed to be authentic and absolutely perfect. 

I have measured the shirt and: 

The neck measures 17.5 inches from button to button hole.

 The sleeve length is 37/38 inches from mid-collar to the end of the cuff. 

Across the back, laid flat, the shirt measures 25 inches armpit to armpit and 33 inches from the collar seam to the bottom of the back tail.