Sanforized Blue Denim Embellished Aztec Patch Vintage Shirt, Byron Bay. Sanforized denim has been stretched, fixed and shrunk in length at the mill. This is done in order to reduce the amount of shrinkage that can happen after your jeans’ first wash. Beautiful blue wash cotton. Button down front. Aztec frayed large patch on the back, making this piece one of a kind. In immaculate vintage condition.