RW&Co Men's dress shirt

Beautiful grey and red check shirts with embroidered lines on a white background by RW & Co. There is fabric tag, but it feels like cotton. Excellent condition with no signs of wear. Size is 15 1/2" neck in medium, but the back has been darted on both sides. The darts have about 1/2" of fabric allowance inside at their widest, so it can be let out a bit. Measurements (see pictures for how I measured it): Neck: 15 1/2" Shoulders: 18 1/2" Pit to pit: 21" Waist: 18 3/4" Sleeve (from shoulder seem to the end): 25 1/2" Length (neck to bottom): 30 1/2"