User blog comment:Xilinoc/Ch. 585 - The Headless Star 4/@comment-24577094-20140618164118/@comment-5398287-20140618180748

The Shutara Scale seems to measure the balance of Souls and Hollows between the two planes (The Human World and Soul Society). It seems more likely that Shutara is just really good at making snazzy clothes that also protect the wearer from basically everything.