Would you mind posting a picture of your hair so I know how to explain it?
as for materials, just stay away from shiny fabrics. I used alot of cotton because conventions get really hot, and cotton is a very light weight fabric and it is also very comfortable.
as for patterns... thats very easy really. Just go to your nearest fabric store and look through the SIMPLICITY pattern book. (I say Simplicity because they are the best patterns. They are cheap and easy to use.) If you need help finding a specific pattern though, let me know and I would be happy to help.
The head phones are really easy to make. Just get a head band that is the color of the head phones, and then get foam the same color and construct it from there! thats how I made mine! (my miku ones anyways. )
Thouse arent mine, but thats basically what I did to make mine. I also got piping and covered it with duct tape and made the microphone part out of it. (I will post a picture later if you want to see it as a better reference picture, since mine came out MUCH better then this one.)
As for the Kaito cosplay, get the Simplicity Matrix coat pattern for it, thats what I used for my ex-boy friends kaito jacket and it came out WONDERFUL.
Let me know if you need any more help! I'm a pro at Vocaloid cosplay making!