Brief updated: the workout tanks and bicycle shorts that I ordered came in today and both are huge, so that's disappointing. Hopefully I have better luck with the sports bra and pants when they come in.
Beyond Yoga is size inclusive and there is a ton of give to the fabric. I can wear multiple sizes, so if you error on the size of too small, you can lose a significant amount of weight and stay in the same size. (It’s pricey.)