I wanted to write a detailed review as I know I read all of them when determing my size, so I hope this is helpful! Some notes: I am very sensitive to compression (as in, I really don't like it), and also sensitive to anything that cuts high in the armpit region. Before I was pregnant, I rarely wore bras, but now at 11 months postpartum (and post-breastfeeding), it is also not comfy to not wear a bra so *sigh* here I am, buying a new bra. My measurements are around 34-35" below my breasts, and 40-41" across my breasts. I have a second hand Dani that is super worn in in a size L that fits great, and I had bought an Andie during pregnancy that felt VERY tight, and only began feeling comfortable recently after many wears and body changes, though still quite compressive. I also have a second hand thompson bra in a M that is quite comfy. So yeah, I was a bit stumped on sizing.
I decided to order the Carrie in a size XL to see if that would allow me to wear it right away vs breaking it in. And it is great! It's sooo comfy right out of the package and though I imagine a L would've also felt okay with a few wears, I am glad I can wear this more like a tank top with high rise pants. I'm really happy with it and can see myself wearing this one lots. I think if I were to buy another Carrie I'd probably go with a L, but anticipate a wear-in period to have more of a bra-like style.