Definitely size up
"It’s really cute but I sized up from an XXS to an S and it’s still a bit tight (I’m 5’1/125lbs). Also, the corset in the back is tight too. I had to remove the string completely in order to put it on. I’m worried that if I get a larger size then I’d be able to slip it on but nothing else would fit correctly. The big issue I have is just being about to put it on with ease. Otherwise, it’s super cute 🌸"