Hmmm, when I bought my coat I got it on a good sale from Dover. I went to their online chat and told them my measurements and the coat I was interested in and they told me the best size for me and it fits perfectly. Unfortunately the size you wear varies by the brand of jacket. It's like breeches, you might wear a 28 in one brand and then have to get a 24 in another. My guess is you would be close to a size 2. My bust is 32-34 and I wear a size 4. Some brands don't make those sizes too. Good luck. Shopping for show clothes can be a challenge.