Wow, it is really nice to see a few people who are close to my age, height, and size.
I'm 5'1" and 136lbs. According to most size charts, I have a small chest, large waist, and medium hips -- just what every girl wants, right?
I wear US 10 pants, around 130lbs I start fitting into 8s again. I fit well into size M dresses (covered with M cardigans) as long as they're not tight in the waist. And honestly, I haven't worn a top other than a baggy t-shirt in forever, because my chest needs a small and my arms need a large.