From an unused root (probably meaning to bind); properly, twisted (yarn), i.e. Tapestry -- fine linen.
H330. etuwn
אֵטוּן noun [masculine] thread, yarn (etymology unknown; on form see Ges84a. 12. R. Talmud אַטוּנָא אֵטוּנָא,, cord, rope; so ᵑ7) construct ׳א מִצְרַיִם Proverbs 7:16.