Good gracious girl, why are you fixed on a number?? Do not compare your weight to your husbands. a number for weight does not define and is unique to everyone. This you know I am sure. As for sizes.. its good to wonder, but do not obsess. You will probably shop in the misses or juniors department OR you will have to use alterations.
Hooray for the new clothes!! Sounds awesome!! Oh, and DO BUY PRETTY UNDERWEAR!! Its amazing how it makes you feel! Its a moral booster, or at least it is for me