וְלָקַחְתָּ֣ אֶת־הַבְּגָדִ֗ים וְהִלְבַּשְׁתָּ֤ אֶֽת־אַהֲרֹן֙ אֶת־הַכֻּתֹּ֔נֶת וְאֵת֙ מְעִ֣יל הָאֵפֹ֔ד וְאֶת־הָאֵפֹ֖ד וְאֶת־הַחֹ֑שֶׁן וְאָפַדְתָּ֣ ל֔וֹ בְּחֵ֖שֶׁב הָאֵפֹֽד׃
And thou shalt take the garments, and put upon Aaron the tunic, and the robe of the ephod, and the ephod, and the breastplate, and gird him with the skilfully woven band of the ephod.
Read kabbalistic (mystical) interpretation of Exodus 29:5: and classical mystical sources.