Where does “nightshirt” come from?

I cannot write an accurate etymology sentence for this entry because the provided chain contains only circular repetitions between "English night" and "English nightclub" with no connection to the headword "nightshirt" and no meaningful etymological progression to older languages or forms.

nightshirt (English): A shirt-like garment that is worn to bed

Definitions

  1. A shirt-like garment that is worn to bed

Ancestry of “nightshirt”, step by step

nightshirt traces back through two separate lines of ancestry.

via English night

StepLanguageWordMeaning
1EnglishnightThe period between sunset and sunrise, when a...
2Middle EnglishnyghtAlternative form of nighte; Alternative form of...
3Middle Englishnightenight
4Old EnglishnyhtAlternative form of niht
5Proto-West Germanicnahtnight
6Proto-Germanicnahtsnight
7Proto-Indo-Europeannókʷtsnight
8Proto-Indo-Europeannegʷ-bare, naked

via English shirt

StepLanguageWordMeaning
1EnglishshirtAn article of clothing that is worn on the upper...
2Middle EnglishschirteAlternative form of sherte
3Old Englishsċyrtea short garment; skirt; kirtle
4Proto-West Germanicskurtijāskirt, apron
5Proto-Germanicskurtijǭskirt, apron

Words derived from “nightshirt”

Every word from Proto-Indo-European negʷ- →Every word from Proto-Indo-European nókʷts →Every word from Proto-Germanic nahts →