Like others have said, order a size larger. I'm a L pre-pregnancy but have a huge belly at 35 weeks. I purchased the L/XL and I think (hope!) it will still fit when I'm in labor. I have a few inches extra room at the moment.

One downside is the washing instructions. If you use this for labor and delivery, keep in mind that it must be washed on cold and no tumble dry. Not great in completely disinfecting it post-delivery.

It's also a very thick material. I was expecting something lighter.

Otherwise, it's a beautiful alternative to a hospital gown with great access for IVs, epidural and skin to skin.