I’m a pretty consistent medium top, large bottom. I bought the large which fit perfectly everywhere except the bust. I had to take it to be altered. But now that it fits perfectly, I love it. I can actually wear this color pink fabric, even with a cool skin undertone. I look terrible in most pinks. IMO it looks even better with sun kissed skin.
For reference, I wear a medium in the Ellie and the Kimmy.