וְדָוִ֞יד מְכֻרְבָּ֣ל ׀ בִּמְעִ֣יל בּ֗וּץ וְכָל־הַלְוִיִּם֙ הַנֹּשְׂאִ֣ים אֶת־הָאָר֔וֹן וְהַמְשֹׁ֣רְרִ֔ים וּכְנַנְיָ֛ה הַשַּׂ֥ר הַמַּשָּׂ֖א הַמְשֹֽׁרְרִ֑ים וְעַל־דָּוִ֖יד אֵפ֥וֹד בָּֽד׃
And David was clothed with a robe of fine linen, and all the Levites that bore the ark, and the singers, and Chenaniah the master of the singers in the song; and David had upon him an ephod of linen.
Rashi on I Chronicles
And David was enwrapped in a linen robe - Heb. מְכֻרְבָּל enwrapped, as in Daniel (3:21): “their robes (וְכַרְבְּלָתְהוֹן).” A similar case is the comb (כַּרְבַּלְתָּא) of a rooster.
Rashi on I Chronicles
and all the Levites were likewise enwrapped in linen robes, and since David was a singer like the Levites, he too wore their raiments, which they wore, and proof of this - to distinguish between the unclean and the clean: It was the custom of the heathen kings and princes, that when they would dine with their priests according to their custom, they would don the garb of their priests.
Radak on I Chronicles
and Chenaniah the leader of the... song - Heb. הַשַּׂר הַמַּשָּׂא. The noun in the construct state is missing.[It should be] הַשַּׂר שַׂר הַמַּשָּׂא, the leader, the leader of the song, and similarly, (Jos. 3:14): “the Ark of the Covenant (הָאָרוֹן הַבְּרִית),” and others.