I have to agree even though it a low ponytail you probably same yourself a headach but getting a wig designed to be pulled up.
http://www.cosplay.com/showthread.php?t=185958
But you can use a Eowyn in Light Grey (107) and one pack of wefts to creat the upped up hairline at the bottom.
http://arda-wigs.com/collections/lig...cts/short-weft
http://www.cosplay.com/photo/1856066/