There might be some higher-res textures for that hair already made, in the store or in free stuff.  That's often how it works.  One person models the hair, and then others make extra texture packs for it.

If you want to try other hair props, try Koz's hair.

http://digitalbabes.jp/

It's free, and better than a lot of more expensive hair.  It was made for the older figures, but it's pretty easy to use V3 hair on V4; just position it and parent it.