I’m a medium and bought a small bc that’s all that was left. And based on the reviews I assumed I could squeeze into a small. Turns out the small fit perfect. It was even like hard to get into it I would have thought it was a medium bc it fit as it should have. I always give my measurements to give a better idea of how it could fit someone else. So based on my assessment I’d say it runs small. Since the small fit when I am a true medium lol. My only dislike is bc I’m short so I want my mid to show! But it doesn’t unless I have on low rise jeans which I never wear. Height: 4’11. Weight: 140lbs, Measurements: hip/butt 40in, chest 32DD or 34D, waist I fluctuate between 27.5in-29in. So my general size is a medium. So still 5 stars it’s cute.