Maternity clothes

Catherine • Wife. Mom to 3 + 1 on the way! 👩🏼👧🏻🧒🏼🤰🏼Dog mom! DV survivor. 💜 Georgia 🍑🇺🇸

How does sizing work? I never wore maternity pants my first pregnancy, just tops, but I’m only going on 16 weeks and need maternity pants. I’ve seen a lot of people recommend Ross for maternity but is it S/M/L or numeric sizing?