Always struggle for tights as I'm not quite plus size but I'm 5ft 10 and long bodied and everything ends up with the crotch mid thigh for me
Anyway just ordered some and they fit! I'm a size 16 and got XL
Pretty Polly 3D (I went for 150 denier matt)
Thought I would share in case it helps someone, they're comfy around the thighs and come up about two inches over my navel