I am 5-6 and a size 14. I bought a size large and they fit so great.
They are a lovely soft yet thick fabric, great to snuggly up in the house or team up with trainers.
What a great price.... I even bought them in navy!!!

I am a size 8-10 and the Small fits perfectly. The material is really soft and snuggly warm! There is the Bench logo on the back of the waistband in white, which you can't see from pic here. I'm 5'4' and they're about 2 inches too long (but still fine to wear). Such a bargain for the price.

Feel great, look great and fantastic for the price! I bought a M which is about a size 12, though they are quite long on me but i'm only 5"4 so would prob be perfect on taller people.