Preface: I havent worn these outside yet
I am petite 5’3” 120# with athletic legs/butt, and I was having a hard time deciding what size to get, so I figured I’d share with you all what I found!
I got a 2019 Small in toffee and a 2020 Small in Moab to compare. I generally like slimmer fitting gear so I don't look swamped by my clothes. The 2020 Small was about 1/2-3/4" too big in the hips, butt, and upper of the bib, but I did like that the lower legs had a wider opening. The 2019 Small was much better for me, a little tighter across the hips and thighs but not restricting, and the Toffee color is amazing!
If you're not as petite as me, the 2020 may offer a better fit for less petite athletic builds, there was definitely more room in the hip/butt region and upper of the bib. As the 2019 small fit me snugly, trewsizing suggested that the 2020 XS would probably be too small for my badonk. Hope this helps.
Cant wait to try out these bibs next season! Loving all the pockets