This is a very nice nightgown, roomy and comfortable. I like the length, and fit is loose but not too loose. The material is soft and light, I tend to get warmer as the night goes on, and this stays comfortable.
I ordered the pink, which appears to be pastel in the pictures, but is actually quite bright. That is a little disappointing, but overall I'm very pleased and may even order another one. It does take a while to arrive.
For reference, I'm 5'4 and 145 pounds (not athletic!) and the medium fits perfectly. The bust area is not tailored, which is a good thing - it will fit nicely regardless of bust size.