Green’s Dictionary of Slang

dud n.1

[ety. unknown]

1. an article of clothing, esp. a cloak, made from rough, coarse cloth; thus dudded adj., clothed.

[UK]Promptuarium Parvulorum 134/2: Dudde, clothe, amphibilus.
[UK]Skelton Agenst Garnesche iii line 42: Dekkyd lewdly in your gere [...] Ye had a knavysche cote Was skantly worthe a groate; In dud frese ye war schrynyd, With better frese lynyd.
[UK]G. Parker Humorous Sketches 31: To his very last dud Nick would readily fence.
[UK](con. 18C) W. Scott Guy Mannering (1999) 148: There was not one, from Johnnie Faa the upright man, of the gang to little Christie that was in the panniers, would cloyed a dud from them.
[UK]Lytton Paul Clifford I 108: ’Gad, I remember when I had not a dud to my back.
[US]G.D. Chase ‘Cape Cod Dialect’ in DN II:v 296: dud, n. Old garment. ‘Any old dud’.
[US]Kerouac On the Road (The Orig. Scroll) (2007) 135: We milled with all the cowboydudded tourists and oilmen.
[US]Kerouac On The Road (1972) 35: The cowboy-dudded tourists and oilmen.

2. a rag, a cloth.

[UK]Dundee Courier 15 Jan. 3/3: Her well-used dishclout [...] was only discovered after the social party had got at the depth of the pie and [...] the ‘dirty dud’ was pulled forth.

In compounds

dud-dropper (n.)

see separate entry.