Green’s Dictionary of Slang

dishclout n.

[metonymy; SE dishclout, a kitchen rag]

a dirty, greasy woman; thus a female servant.

[UK]Skelton Agenst Garnesche iii line 36: A bawdy dyscheclowte, That bringyth the worlde abowte With hastynge and with polleynge.
[UK]Look About You xxviii: Why, she is a very dowdy, A dishclout, a foul gipsey unto thee.
[UK]Fletcher Spanish Curate IV vii: Why Maid there, Open I say, and do not anger me [...] When, ye Dish-clout? When do you come?
[Scot]Caledonian Mercury 9 Sept. 1/2: Plaintiff Daniel [the groom] demanded a sop in the pan. Defendant Dishclout[the cook] insisted on a right of refusal; Daniel seized Dishclout by the left hand [...] Dishclout took Daniel by the right hand, and pulled him into the dripping pan.
[Scot]Caledonian Mercury 17 June 1/1: [He] was footman in the same house where defendant Dishclout was cook-maid.
[UK]Grose Classical Dict. of the Vulgar Tongue.
[UK]Lex. Balatronicum.
[UK]Egan Grose’s Classical Dict. of the Vulgar Tongue.
[UK]E. Howard Jack Ashore I 297: Come, tramp with your dishclout, you fiddle-faced, dog-robbing, trencher-scraper.

In phrases

make a napkin out of a dishclout (v.) (also ...out of one’s dishclout)

1. to marry a kitchen servant.

[UK]Grose Classical Dict. of the Vulgar Tongue n.p.: He has made a napkin of his dishclout, a saying of one who has married his cook maid.
[UK]Grose Classical Dict. of the Vulgar Tongue (3rd edn).
[UK]Lex. Balatronicum.
[UK]Egan Grose’s Classical Dict. of the Vulgar Tongue.

2. by ext. of sense 1, to make a foolish, unsuitable marriage .

[UK]Partridge DSUE (8th edn) 778/2: from ca. 1750; ob.