I'd like to know more about the Matlock Shirt as well. I am assuming that the pic on RL.com is a pre-production pic. I definitely prefer the cross "x" pocket pattern.
How is the sizing? RL.com specifies relaxed workshirt. I am generally in between sizes M and L. 6ft, 170lbs, chest size ~41.
-RRL Slim fit button down shirts size L (haven't tried any RRL regular fits yet). Edit: I have a RRL Henley in Large. It's a touch roomy, with a light undershirt underneath, but not too bad.
-Polo Custom fit shirts size L
-Polo Standard for M or L (depends on the shirt)
Bought it in a Medium. I'm 5'9" 165 lbs. and barrel chested. I always buy Standard-Fit RRL shirts in Medium. The Slim-Fit shirts tend not to work for me—Mediums are too tight at the chest and the Larges are usually too long, both at the hem and in the sleeves. The would like it if the Matlock sleeves were a bit shorter, but the shirt is well within my comfort zone.
Here are the measurements for the Matlock shirt in Medium:
Chest (armpit to armpit): 21.5"
Shoulders (shoulder seam to shoulder seam, across back yoke): 17.5"
Sleeve (shoulder seam to cuff): 26"
Length (back collar to hem, back): 31"
If you're 6-foot tall and lean, I would guess the Medium would be a good fit.