This listing is for a very nice high quality button down shirt from Carhartt.  The inner tag is faded but to me it looks like 4X regular.  Please check measurements.  The shirt is a thicker fabric compared to the average button down shirt and done in a woven material.  

The plaid is done in blues, black, beige and off-white.  The shirt has a folded collar and two upper front flap pockets.  It has long sleeves.  This is a great shirt in very good pre-owned condition and the measurements are:  

Chest is approximately 31 1/2"  -  63" buttoned

Length is approximately 32" in front, longer to 33 1/2" in back

The fabric tag is faded but I would guess this is probably cotton or a blend of some sort.