The coat was a loose and large garment made with sleeves, worn under the ephod, reaching down to the feet, which was girt with a girdle, Leviticus 8:7.
Related Commentaries of Exodus 28:39
Exodus 28:39
39 And thou shalt embroider the coat of fine linen, and thou shalt make the mitre of fine linen, and thou shalt make the girdle of needlework.