Such a cute top - feels secure enough that I could wear without a bra if I wanted too. Adjustable straps and shirring are a great touch.
I bought a size 22 and I'm so happy with the fit! (got relatively small ladies though, so maybe size up if you have cleavage!)
I bought this in a AU 16 and it fits like a glove, not too tight but definitely hugs me just the way I need it to. This top allows for the girls to sit in place without the need for a bra which is perfect.