Apropos of nothing, my favorite shirtmaker Joe Hemrajani was talking about patterns the other day (he has dispensed with paper patterns in favor of a CAD system that cuts shirt pieces mechanically, improving consistency) and mentioned that so many customers are spending so much time at their computers that they have begun to stoop forward. To compensate for that, shoulders on his shirts are being cut to provide for a forward curve to the seam as it progresses towards the arms from the neck.
The top photo shows normal posture. The bottom shows what happens to that posture after hours of reaching towards a keyboard. And this forward slant to the shoulders creates wrinkles in the cloth, particularly near the armholes, that are prevented with properly cut cloth. It is the kind of measurement detail that requires an experienced eye, which is why I always recommend that men are measured by a professional and get those measurements perfected before they begin ordering shirts online.
Thanks to Joe for being kind enough to pose.