Hello there! I don't know how much of this costume you've already figured out how to make, but I'll give my opinions on what you've got listed.
The hair accessories: you could use hair curlers like these http://i.istockimg.com/file_thumbview_a ... urlers.jpg
and wrap them in material. You could even go cheaper and use toilet paper rolls. You can make them tighter, too. You might also find a way to attach a hair clip to it so it stays better.
The arm band/braces: for the band, get some white material and blue fabric paint and make it. Use elastic to keep it up. Same thing for the braces, just use blue material and no need for paint.
The shirt: you might be able to find an Asian style shirt, or make one using a chef coat and take off the sleeves, then add white material for the white parts. You might even be able to go to a store that sells dance wear and find a leotard in the color you want then add to or dye it.
The fur/pelt around the waist: get a brown skirt, cut it up to look like the one she wears, then go to a fabric store and get some fur trim then sew it on
The apron thing: get a dark blue waist apron. Cut up and re-sew to make it look right
Pants: baggy sweat pants might work. Or doctor pants from a medical surplus store.
Any questions, feel free to message me!