I'm 5'8" and low 160's with a 33/34 waist (I'm more muscular and thicker chest shoulders from lifting than the average cyclist, plus could loose another 5 - 10). I started with a large Assos bibs and took it back for an XL. I found the large fit good thru the waist, etc. but even at 5'8", I thought the bibs were a little short in the leg, at least compared to what I was used to. I wear a med or large in PI's and Giordanna.

For me, I find the Assos bibs more comfortable than my PI microsensors and Giordannas.