To my fellow Trek Jellies: Can you help me with my 7 of 9 costume?

For a few years now, I have been trying to put together a 7 of 9 costume. I think I can find the jump suit all right though it is dang hard to find the exact right one I can tell you and the visible cybernetic implants shouldn’t be hard to do. However, there are a couple details that I have no idea how to go about. The first is her hair. I have no idea how to get my hair in that nice neat little bun that she wears. The other is her carapace. Can my fellow Jellies help me out with this costume?

Just to clarify, any help with any part of the costume would be much appreciated but those are the two bits I see myself as having the most trouble with.