Define Flax used in ancient mesopotamia clothing?

Flax (also known as common flax or linseed) (binomial name: Linum usitatissimum) is a member of the genus LINUM in the family LINACEAE. It is native to the region extending from the eastern meditranian to India and was probably first domesticated in the fertile crescent, Flax was extensively cultivated in ancient Egypt. (NewZealand Flax is not related to flax, but was named after it as both plants are used to produce fibres.)