I’m a 32” bust and made the size 2.
It’s quite roomy so I would happily have made the size 1 for a snugger fit too.
This was a fun knit with all the short row shaping though I found I wasn’t managing to carry the contrast colour up the main colour stripes without it showing so I ended up with a lot of ends to weave to at the end!
I’m not sure how much of the second skein of the main colour I used as when I weighed it at the end, it weighs 100g so not much but definitely used a little!