I'd do a little research into both those websites before making a purchase. They both look like nice costumes, but I'm a little suspicious of the first website due to the lack of stock photos. It makes me think those images may have been taken from a cosplayer's profile.
Either the Scruffy or Wisp from the Cosplay.com wig store could be made to work for Sheik, but just know that it can take a long time to get them.
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Working on: OoT Zelda
Planning: Four Swords Zelda remake | TP Zelda | Jarael