I purchased these to wear under a mini dress and they look great both as bloomers and as shorts.

I'm 5'3 and normally wear a petite XS, 00 or 23 in jeans. I tried these on in S, M, and L. Strangely, they all fit roughly the same.

I couldn't tell much difference between the 3 sizes. You can see in the attached photo that there's maybe a half inch more room in the M than the S (the inside-out photo, you can barely see the M under the S). When I walked around in the S it hiked up a little, but the M and L fit exactly alike. They pretty much all fit like a US 0/2.

That said, these shorts are adorable and super comfortable. The lace is soft and well made. The liner is linen. Though the waist band looks tiny it's light, stretchy and not binding at all. These feel so much like lounge shorts that I actually fell asleep in them. I'm looking forward to styling them this Spring/Summer.