Yeah you have a pretty petite build, you're probably a 6C in reality, but glhf finding that haha. Bras n Things actually has a really good range of sizes. One of my exes tried to be 'romantic' and get me something from Victoria Secret (probably more of a present for him but whatever) and he assures me that after trying to tell the store the store assistant my size by saying 'it's more muffin than cupcake' he walked out with the biggest size he could find. It was a C lol. They pretty much only stock the absolute standard sizes at VS and Cotton On Body (the sizing at Cotton On is really weird actually, I always go a size down there) but Bras n Things have a loads better variety and still have pretty designs for more unusual sizes. You'll definitely find 8s there