Maybe it is because the one I tried is a buttondown oxford collar rather than the regent spread.
I have not actually unwrapped the new regent to see if it is box or side pleat so maybe they still have side pleats. Unfortunate about the sleeve sizing...I think I might be better serviced by a 15.5, but without the sleeve option, they are going to end up too short.
Also, what is up with the thead title?