Where did vikings get linen?

Answer 1

Linen is made from fibers in the stem of the flax plant, a slender, erect plant that grows about 100cm (40in) tall. Earlier references suggest that flax grew only in the most southerly of the Norse lands during the Viking age. However, more recent evidence suggests that flax was cultivated in the more northerly lands, including northern districts of Norway and Sweden. Both pollen samples and placename evidence in Iceland suggests flax cultivation there, as well, although it seems unlikely that flax would flourish there.

However wool was much more common in Viking clothing.