You should be able to just braid it..Be sure to make it tight enough at the start of it (the part toughing your head). Or even using a hair tie on that part to keep it together. I'm not sure if she HAS a hair tie there or not..If so, then I guess you should lol If not I think you can get a clear rubber band for that so it's harder to notice..Then one at the end of course lol
However, If it's a slightly (or really at all) layered wig, you WILL need produck..I would just use hair spray..
Hope this helps
Cosplay DA Regular DA
Kumoricon 2014 (so far):
-Sora (Kingdom Hearts 2)
-Serena (Pokemon Y [It's the one I have lol])
-Akaito (Vocaloid. Black & Red Ver.)