I am pretty flat chested and full-zip jerseys (those that I have tried anyway) do not work well for me, they always sort of bunch up.

I find that Retro Image Apparel jerseys fit me well (although I order a size up from the usual). I also have a Hincapie jersey that's great. Shebeest jerseys don't really work for me. Sugoi is generally okay. Not sure what is available in Australia though.