Marilyn is my size in every way, i'm 9 1/2 stone at present, my waist is a little bigger at 25" I was 8 1/2 stone before i became hypothyroid, but i like the little extra weight i've gained.
That is far from fat, if those are her correct measurements.
I don't think she was overweight and I wouldn't say she was plain. She wasn't a great beauty either - more glamorous than beautiful, I would say. She wasn't much of an actress but she did appear in several very good films.