I have a snug fitting PHWM. Would some of you fit gurus please advise me on how much bigger I should go if I want a looser fit that doesn’t turn into a sack. Often people don’t include a waist measurement in listing but I imagine it’s pretty important. Shoulders least important and P2P most important. My PHWM is 21 P2P. Should I be looking at 22 P2P, 22.5? In other words will an inch make a big difference regarding fit or will it be subtle? Thanks for helping me avoid a future mistake!