With a robe of fine linen, i.e. with a linen ephod, as it is explained in the close of this verse, where this circumstance is repeated, because it was a notable and unusual thing for David, who was no Levite, to wear a Levitical garment. Of this and the following verses, See Poole on "2 Samuel 6:14", See Poole on "2 Samuel 6:15", See Poole on "2 Samuel 6:16".
Related Commentaries of 1 Chronicles 15:27
1 Chronicles 15:27
27 And David was clothed with a robe of fine linen, and all the Levites that bare the ark, and the singers, and Chenaniah the master of the songb with the singers: David also had upon him an ephod of linen.