This is an incredibly soft sweater, but since there's not tag I haven't any idea what material it's made from.  It like a combination of angora and silk, but I highly doubt it's either.  

This sweater has  a lot of stretch/cling to it, so it should fit a range of sizes from XX-small to small.  It's very hard to measure cling-fit design sweaters, but I'll give it my best shot with the listed measurements below.

It's extra long, because it's designed to go below the waist.