This closely resmebles sakon/ukon's necklace from sound 5.
Things i recomend buying:
Black ninja shoes:
http://www.imvu.com/catalog/product_info.php/Cosplay-Shoes/Ninja-Shoes-BLACK-by-ann0820/products_id/109378
Purple waist rope:
http://www.imvu.com/catalog/product_info.php/New-Accessories/Rope-Tie-Belt-Male-by-RyuPa/products_id/247367