the priests wore only linen. given the unfavourable growing conditions of flax, and the labour intensive method of production, it is probable that linene was a luxury item compared to wool. those who wrote the scrolls might have been related to priestly families or had the resources to buy linen which they they considered as more in line with holiness.
19-year-old construction worker seriously injured after falling from scaffolding in Harish (Haaretz)
from the article: Overlooked relics may help unearth Dead Sea Scrolls' authors