with the robe. A special various reading called Sevir (App-84), with some codices, one early printed edition, Septuagint, Syriac, and Vulgate read "and with a robe". This necessitates conformity with the Hebrew text: "With the garments of salvation will He, &c, And with a robe of righteousness will He", &c.
a = the.
decketh himself, &c. = adorneth himself (with a turban such as worn by priests).