C. F. Keil and Franz Delitzsch on Genesis 41:42

Gen 41:42

As an installation in this post of honour, the king handed him his signet-ring, the seal which the grand vizier or prime minister wore, to give authority to the royal edicts (Est 3:10), clothed him in a byssus dress (שׁשׁ, fine muslin or white cotton fabric),See my Bibl. Antiquities, §17, 5. The reference, no doubt, is to the ἐσθῆτα λινέην, worn by the Egyptian priests, which was not made of linen, but of the frutex quem aliqui gossipion vocant, plures xylon et ideo LINA inde facta xylina. Nec ulla sunt eis candore mollitiave praeferenda. - Vestes inde sacerdotibus Aegypti gratissimae. Plin. h.n. xix. 1. and put upon his neck the golden chain, which was usually worn in Egypt as a mark of distinction, as the Egyptian monuments show (Hgst. pp. 30, 31).