First let me say, I am 5'5 between 180-190 and i carry my weight in my thighs(thick) and butt. These jeans fit extraordinarily well. Now on to size, I first ordered a size 13. Stretchy. They fit great and I have big thighs and calfs, so a little tight in those areas but the fit was great. They well stretch throughout the day.  Now I read reviews that some experienced the seams ripping and I'll tell u why. The 13 fit great. But with my big thighs and calfs I could already see the seams in those areas, would not hold up over time. So I sent them back and got a size 15. They were nice and roomy, still very stretchy but even MORE comfortable. The fit was excellent.
If your undecided about Fashion Nova Classic High Waisted Jeans, these are the exact same ones. Fashion nova buys from the wholesaler "Vibrant". Just order them from Amazon. They are amazing.