ISO 16322-3:2005 specifies procedures to measure the spirality or torque of woven and knitted garments after laundering.
The results obtained from different procedures may not be comparable.
ISO 16322-3:2005 is not intended to measure the spirality of garments as manufactured, but rather the spirality after laundering.
Note that some fabric constructions, such as denim, may have spirality intentionally introduced during manufacturing. Garments made of fabrics from circular knitting machines may have inherent nonverticality of wale alignment.