I've had that same problem. Most of the stores go up to size 14 and call it large! But if you go to their outlet stores - they have screeds of 10's and 8's on the racks - obviously not many people buy them.
I discovered Jacqui E when I lived in Wollongong, I'm so glad that they have moved over here - they can always be counted on to have something nice that fits and looks good!