HI,
I will try to answer the best tht I can. The dress is marked a size 20 but because it is from the 90's It's very possible that it is more like a size 18 US sizes. I think this dress would fit you fine from the bust down because you can tighten it up in the back with the two ties. I don't think it will fit you through the shoulders. If you know a seamstress or a place that does alterations it could be adjusted and made to fit you. I don't know if that is in your budget but I don't think you will be happy with the fit if your don't have it altered. If you look at the dress and zoom in you will see that the shoulders are very large for the dress form. I think that is what it would look on you if not taken in at the shoulder seams. The sleeves need to be taken off and the shoulders cut down and then the sleeves sewn back on. I hope that answers all your questions. If you think it will work let me know and I will adjust the price so you can purchase it. Kathy