Your duds are your clothes. Your grandmother might hand you a hundred dollar bill at the mall and say, "Go buy yourself some new duds."
The noun duds is an informal, slang term for "clothing." You can pack your duds in a suitcase before a vacation or arrange your duds by color in your closet. Though experts aren't sure where the word duds came from originally, they know that it was dudde in the 1300s, which meant "cloak or mantle," and later came to be duddes and to mean "ragged clothing."