There is just about no such thing as standard sizing any more,except for a few reliable brands ie Cue is still awesome with standard Aus sizing.I do think plus size brands like City Chic who aim for Sz14+ range are more accurate with sizing.Most of these have their own sizing range however ie City Chic Sz XS=Sz14 Aus, Taking Shape TS is the same also.Leona Edmiston Sz 3= Sz14Aus. etc.

Asian sizing is notoriously small.

You can do an Australia only search.Maybe the One Size search.

If you see an item you like & aren't sure that it will fit,msg the seller to ask for say flat bust measure in cms or lenght etc,if they do not include measurements in their listing.I take bust measure between underarms as it is usually right across the bust line.Just as a rough idea of how to size yourself or where a seller will probably measure that.

Never rely on tag size alone,it is not accuruate.