Love her~ She's a great vocaloid and looks like a lot of fun to cosplay (But also very difficult o-e)
For the shoes, you could either do stockings and shoes (like miku cosplayers here
. If you look closely she's wearing heels and modified stockings.) Its hard to tell the difference if you do it correctly~
Or shoe covers might work well, but it would be more expensive and time consuming (click here
to see what I mean).
But either method would work!
For the wig, you can just buy one and do some cutting. (Like this one
maybe? Search 'light purple wig' on ebay and you can get come good ones).
There are great tutorials all over youtube for cutting and styling wigs, so doing a quick search should bring one up ^^
For the hair things, you will probably have to make them (maybe some foam would work? Like the kind these
are made of? Know what I mean...kinda? xD). I cant really think of anything else to do to make them, so that might be your best bet. :3
Anyway, I wish you the best of luck on this costume and I hope I was semi-helpful. xD If I was confusing, please let me know and Ill try and clarify!