2 Samuel 6:20

20And David returned, so that he might bless his own house. And Michal, the daughter of Saul, going out to meet David, said: “How glorious was the king of Israel today, uncovering himself before the handmaids of his servants, and being unclothed, as if one of the performers were unclothed.”
6:20David was not naked when he danced, but was wearing less clothing, wearing above the waist the linen ephod, and wearing some type of garment below the waist (perhaps the type of short pants worn also by priests and Levites under their robes), so that he could move about more freely when dancing.(Conte)
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