I could be totally wrong when I say this so correct me if I am but I wanna say that you're going to have to get some extra wefts so you don't see the base netting of your wig.
Unless you can pull the sides of the wig back without any other issues then personally I would use some kind of curler as a base for the top of the wig pin the wig fibers to the curler hair spray whatever stiffining glue etc, then touch up anything that looks out of place.
But that is just what I would do there is probably a beter method than mine!
Naka-kon: March 14-16, 2014
Meiko from Vocaloid: 20%
Priest Avatar Regalia from WoW: 5%
Cecile from Code Geass: 0%