Where does “waistcoat” come from?

I need to point out an issue: the chain provided is for "coat," but the headword I'm asked to write about is "waistcoat." These are different words with different etymologies. Additionally, the chain contains problems: - It lists "Latin cubare" twice - It jumps from "Latin cubare" to "Proto-Indo-European h₁ésmi" to "Latin cubare" again (circular/contradictory) - "Cubare" means "to lie down," which doesn't clearly connect to "coat" - "h₁ésmi" is the PIE root for "to be," not related to clothing Could you clarify: 1. Should I write about "coat" or "waistcoat"? 2. Can you verify the etymological chain? (The coat etymology should trace through Old French *cote, Frankish *kotta,

waistcoat (English): An ornamental garment worn under a doublet; A...

Definitions

  1. An ornamental garment worn under a doublet; A...

Ancestry of “waistcoat”, step by step

waistcoat traces back through two separate lines of ancestry.

via English waist

StepLanguageWordMeaning
1EnglishwaistThe part of the body between the pelvis and the...
2Middle EnglishwastSecond-person singular past indicative form of...
3Latinvāstitāswaste (empty place), desert
4Latin-tāsty, -dom, -hood, -ness, -ship
5Proto-Indo-European-teh₂tsUsed to form nouns representing state of being
6Proto-Indo-European-teh₂Used to form nouns representing state of being
7Proto-Indo-European-tósCreates verbal adjectives from verb stems

via English coat

StepLanguageWordMeaning
1EnglishcoatAn outer garment covering the upper torso and...
2Middle EnglishcoteA coat, especially one worn as an undergarment or...
3Old Frenchcotteovershirt, tunic
4Frankishkottacoat

Words derived from “waistcoat

Every word from Proto-Indo-European -tósEvery word from Latin -tāsEvery word from Proto-Indo-European -teh₂