I'm 5'7", 220 lbs, 48-40-49.
I ordered a size 3xl, based on the size chart and speaking with the very helpful customer service.
These fit perfectly. There is gentle stretch, without pinching or digging, and while the fabric relaxes slightly, it did not bag out and I wore these multiple days before washing.
They are full length on me, but do not drag on the floor. The waistband can be high or folded down, but is very soft and supportive when folded.
I wouldn't recommend anyone larger than me try the 3x, as I found it to fit perfectly with a little give. Not sure it would be comfortable stretcher further, but if you prefer more compression in your garments, it might be okay.
I do hope they expand there sizing further, as these are very beautifully made and flattering, and I believe larger people would appreciate the fit and comfort. I bought the matching cross top as well and it fits well too.