1 Chronicles 15:27 - Joseph Benson’s Commentary on the Old and New Testaments

David was clothed with a robe of fine linen, also an ephod of linen “David was clothed with a double garment, with a robe of fine linen, and with a linen ephod. These two garments are expressly distinguished in the account of the vestments of the high-priest, Exodus 29:5; Exodus 28:4; Exodus 28:6; Exodus 39:23. The fabric of them was different; the ephod was made of gold, blue, purple, scarlet; whereas the robe was formed all of blue. The shape of them was different; the ephod reaching only to the knees, the robe flowing down even to the very covering of the feet. The robe had no division in it throughout, but was made whole and round, with an opening in the middle of it, at the top; so that it was impossible any part of the body could be seen through it, especially as the ephod, on this occasion of David's dancing, was thrown over it, and tied, probably, with a girdle, as the priest's ephod always was. David clothed himself with these linen garments on this solemnity, both out of reverence to God, and for convenience, because they were cooler. It may be further observed, that this robe was worn by kings, their children, princes, priests, Levites, and prophets, when they appeared on any solemn occasion, and it covered their other garments: see 1Sa 28:14; 2 Samuel 13:8. David, therefore, dressed himself on this occasion with this long, flowing linen robe, instead of the robe of state proper to him as king of Israel, and which was made of richer materials; and hence he was scornfully insulted by Saul's daughter, as uncovering himself as a king, and appearing in a habit wholly unworthy, as she thought, of his royal character and dignity.” See on 2 Samuel 6:20; Chandler's Review, and Dodd.