AU sites:www.sarafashion.com.au - also stocked at DJs
www.dreamdiva.com.au
www.embodydenim.com.au (jeans)
www.citychic.com.au (IMO used to be good, but now way too much emo/boho happening)
www.mysize.com.au (i feel are very exxy for the quality)
AU stores:Autograph
BeMe (if you can find one

)
Katies go up to size 20
Crossroads go up to size 24
Rockmans goe sup to size 22
Best and Less, Big W, Kmart and Target all have plus size sections, which can all be VERY hit and miss.
Overseas sites:www.drjays.com - for plus size fashion jeans (like Seven and Apple Bottom)
www.bandlu.com
www.torrid.com
www.dorothyperkins
www.svoboda.com for plus size jeans (can also find on Ebay)
www.evans.co.uk
www.duoboots.com
www.igigi.com
www.kiyonna.com
www.alight.com
I have more, but that's the best of them!