E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Old clothes, tattered garments (Gaelic, dud, a rag; Dutch, tod; Italian, tozzi). A dudder or dudsman is a scarecrow, or man of straw dressed in cast off garments to fray birds; also a pedlar who sells duds or gown-pieces. (Compare the Greek duo, to put on [clothes]; Latin, in-duo, to clothe.)