Here's the real truth about the various fitting categories: there's no real way to know, from the information provided on the website. All descriptions you'll see here are ultimately rather vague, providing only general guidelines that may have very little to do with your particular situation.
The real answer is, you have to try them on to see, varying the fit category, the neck size, and the sleeve length all around what you "think" is probably the right thing to buy. That's partly because perhaps 10 years ago, give or take, Penney's stopped selling exact sleeve lengths, and turned from mostly-regular to providing a wide variety of different body fits. At the same time, even the "regular" fit underwent some changes, so it's no longer what it used to be. (The arm diameter is definitely smaller now than it used to be, much to my discomfort -- it's too tight now, and I wish Penney's would go back to the old, original patterns, maybe under a "classic" rubric if they don't want to mess with their current range of fit categories.)
Anyway, every person is different. Once I understood that Penney's had changed all the sizings and I could no longer depend on my old measurements, I bought one of every fit/size around what I thought it ought to be (about 9 shirts, total), and tried them all out. That way, I found what fit me best, and I can order that from now on. I bought the collection on-line, and sent everything back except the one shirt that fit me best. I felt a bit bad about this strategy, since it seemed a bit wasteful, but Penney's got all the other shirts back in still-sellable form, wrapped up all nice as they had come originally. And I buy these shirts in bulk (they're the only work shirts I ever wear), so certainly this strategy is in both my interest and Penney's interest, keeping me as a long-term customer. I would have preferred that the fit categories be more precisely defined, and that exact sleeve lengths still be sold, but when the vendor (Penney's) makes unanticipated sizing changes, we consumers need some way to react sensibly.
Date published: 2016-12-10