I'd encourage you to discuss this with your shirtmaker. All the custom shirtmakers I've worked with built in an allowance for shrinkage. Different fabric responds differently with oxfords typically shrinking a 1/4" and fine poplins 1/8' or so in the collar. Their RTW shirts, such as a 16 neck are actually a 16.25, to allow for this. So the tagged size is the estimate post shrinkage. Most suggest washing and ironing 3-4 times for the full effect.
6/20/16 at 10:36am