First, welcome to cosplay.com!
Second... there's a very lengthy and detailed bleach cosplay thread, located here
. You'll have to search through it - information is widely scattered.
To search a thread, click on the thread, then look up by the page numbers on the right hand side. See the purple bar with "Search this thread"? Click it and enter the words you're looking for. I can tell you right now you won't find "shihakushou", very few of us actually called it that. You'd have better luck searching for the basic pieces, such as: hakama, kimono, juban/underkimono, waraji, tabi. Don't put too many of those terms in at once - you probably won't find much. Try searching them separately. Or you can search google for patterns, now that you know what the basic pieces are.
For the wigs, check out the wig forum. Or see the advertising above? C.com has a great wig store, but I don't know if they ship to Australia. Or enter "wigs" into a google search.
If you have any questions, feel free to search the Bleach thread or PM.
Good luck with your shinigami!