For reference, I'm 5'6" and a US size 8-10 pant. I ordered the OS.

The fabric is a matte finish polyester/viscose blend with spandex for stretch. It is thick and lined, perfect for the cold months and leisurely activities but would probably be way too warm to wear for any activity like dancing or in warmer weather, as you would sweat a lot.

It is comfortable to wear and provides adequate tummy control and smoothing of any lumps. The tummy panel covers up to about 1-2" below the bottom bra line, so be aware there may be a little bulge over the top of the panel if you intend to wear a tight fitting top.

The leg length is long. I am 5'6" with a 33" inseam and there was easily another 2" of fabric at the end of the leg. So taller or leggier ladies, this is a great pant for you!

The fabric does collect hair, so if you have pets or will visit a place with pets, make sure to carry a fabric brush with you.