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deck someone or something out (in something)and deck someone or something out (with something)
to decorate someone or something with something. Sally decked all her children out for the holiday party. She decked out her children in Halloween costumes. Tom decked the room out with garlands of flowers.
deck out somebody/somethingalso deck somebody/something out
to decorate someone or something in something special The stewards were decked out in beautiful new uniforms. Some salesman had decked the car out, giving it racing wheels and stripes on the sides.
Decorate, dress up, as in They were all decked out in their best clothes. [Mid-1700s]