en_tn_lite_do_not_use/est/06/08.md

let royal robes be brought

This can be stated in active form. Alternate translation: "let someone bring royal robes" or "tell your servants to bring royal robes" (See: rc://en/ta/man/jit/figs-activepassive)

on whose head is the royal crest

The word "whose" refers to the horse. The royal crest is a special symbol that represents the king's family.