Charles Ellicott Commentary Daniel 3:21

"Then these men were bound in their hosen, their tunics, and their mantles, and their [other] garments, and were cast into the midst of the burning fiery furnace." — Daniel 3:21 (ASV)

Their coats.— The dresses spoken of here correspond with what Herodotus tells us (i. 195) of the Babylonian costume. As far as can be determined from the etymology of the words, the “coat” was an under-clothing, which covered the whole body; the “hose” was some species of tunic—something “spread out” over the under-clothing; the “hat” (the only one of the three words for which no Hebrew root exists (see 1 Chronicles 15:27)), was a sort of cloak, probably used for State occasions only.