I assume this is the Samus Aran you're talking about?

en.wikipedia.org/wiki/Image:Zero_Suit_Samus.jpg

(A picture is always helpful....)

If you're trying to go cheap, you may be able to make the Megahair freebie work:

http://www.ladyfyre-graphics.com/free_poser_downloads.htm

I believe this is for Posette, but since it's a prop you should be able to manually resize it for whatever figure you're using. (Aiko3? Aiko4?)

In bought products, there's the Prettyscious Tail:

http://market.renderosity.com/mod/bcs/index.php?ViewProduct=64605

I don't own this one, but it's been on my wishlist since forever and looks quite nice.

The Aiko Ponytail:

http://www.daz3d.com/i/3d-models/-/a3-ponytail?item=2891&_m=d

Picked this up in a recent sale; it's not as morphable as I'd like but still a good hair.

The Total Updo:

http://www.daz3d.com/i/3d-models/-/total-updo?item=6279&_m=d

Another wishlist item.

And finally, Evelyn Hair:

http://www.runtimedna.com/mod/bcs/index.php?ViewProduct=2070&Start=73&TopID=68965

I don't own this particular one, but none of the RDNA hairs have been anything but excellent for me.

Hope this helps.