Where does “plainclothed” come from?

plainclothed (English) comes from English plain, from Middle English pleyn, from Anglo-Norman pleyn, from Old French playn, from Old French plain, from Latin plēnus, from Proto-Italic plēnos, from Proto-Indo-European pl̥h₁nós — to fill.

plainclothed (English): plainclothes; wearing ordinary clothes instead of...

Definitions

  1. plainclothes; wearing ordinary clothes instead of...

Ancestry of “plainclothed”, step by step

plainclothed traces back through two separate lines of ancestry.

via English plain

StepLanguageWordMeaning
1EnglishplainFlat, level; Simple; Obvious
2Middle Englishpleynclear; unambiguous
3Anglo-NormanpleynAlternative form of plein
4Old Frenchplayn
5Old Frenchplainfull; plain; flat
6Latinplēnusfull; filled; complete
7Proto-Italicplēnosfull
8Proto-Indo-Europeanpl̥h₁nósfull
9Proto-Indo-Europeanpleh₁-to fill

via English clothed

StepLanguageWordMeaning
1Englishclothedsimple past tense and past participle of clothe;...
2EnglishclothA woven fabric such as used in dressing,...
3Middle EnglishcloþAlternative form of cloth; cloth, garment
4Old Englishclāþcloth, clothes, covering, sail
5Proto-Germanicklaiþącloth
6Proto-Indo-Europeangleyt-to cling to, cleave, stick
7Proto-Indo-Europeangley-to glue, paste, stick together; to glue, stick...
8Proto-Indo-Europeangel-to be cold, to freeze
Every word from Proto-Indo-European pleh₁-Every word from Proto-Indo-European pl̥h₁nósEvery word from Proto-Italic plēnos