Wow. That's a huge head. XD That'll be so cute. I'll die if I can't find you at the con.
Are you worried you'll mess up? Maybe you should make a mock-up first, using cheaper fabrics. I myself take forever to start cutting fabric. And then I take twice as long to actually start sewing. -__-
Currently Working On:
Taki Reizen (Hyakujitsu no Bara)
Gauche Suede (Tegami Bachi)