Gitman = not work shirts
EG in the sense we're talking about = work shirts
Different styles calls for different idiosyncrasies, e.g., bar tack stitching, reinforced elbows. Not really seeing the comparison to be made here tbh. Fabric quality comparisons, maybe, maybe not depending on what GBV or EG is being looked at, but when are you ever going to see an oxford cloth work shirt?