I always suggest going up in size. One, for sheer comfort, two to be able to layer and three, after a big Thanksgiving, clothing seems to shrink a bit. LOL
And if you plan on keeping them for a long time, over time, people tend to put on 10 lbs more than they lose 10 lbs, regardless of their grand intentions of getting into the shape they were in when they were 20 years old.
I'm 6'2", 210lbs. My ASAT wool pullover shirt is a XXL and my bibs are XXL. Both are great and roomy for layering. I'm glad I did not get XL.
In the ASAT light fleece, I tried an XL pullover shirt, and with my broad shoulders, it was tight. I kept it and gave it to a buddy.
I ordered another pullover in XXL and it's great. In the light fleece, the XL bibs fit great. Keep in mind, this is warm weather gear and there's no layering. But the XXL shirt still was better than the XL for me in the shoulders.
I do have wide shoulders, so that's where the XL was tight.
I also found the crusher hats ran a tad small and the XL's were best, if you wear a full head net/mask that the hat will go over.