Major quality difference along with poor customer service. In the photos you can see the major size difference in their medium shirts. When contacted they refuse to remedy the issue stating it is in their size range. Both shirts in the photo is men's medium layer over each other to show the difference in the sizes. I now have spent $25 for a shirt to sleep in. Strictly Shield Republic customer for now on.
I do apologize for any frustration caused. It looks like the other shirt you provided measurements for actually runs a little smaller than the size chart. We do have to allow.5" discrepancy in sizing due to manual measurement. Army Hit The Ground Running T-Shirt - Military Green is measuring where it should be for a size medium. You are able to exchange this with our Beer Guarantee if you like.