Etymology
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Words related to panties

pants (n.)

"trousers, drawers," 1840, see pantaloons. The word was limited to vulgar and commercial use at first.

I leave the broadcloth,—coats and all the rest,—
The dangerous waistcoat, called by cockneys "vest,"
The things named "pants" in certain documents,
A word not made for gentlemen, but "gents";
[Oliver Wendell Holmes, "Urania: A Rhymed Lesson," 1846]

Colloquial singular pant is attested from 1893. To wear the pants "be the dominant member of a household" is by 1931. To do something by the seat of (one's) pants "by human instinct" is from 1942, originally of pilots, perhaps with some notion of being able to sense the condition and situation of the plane by engine vibrations, etc. To be caught with (one's) pants down "discovered in an embarrassing condition" is from 1932.

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-ie 
alternative spelling of -y; now mostly of -y (3), but formerly of the others as well.
pantyhose (n.)

 "sheer tights or close-fitting legwear covering the body from the waist to the toes," 1963, also pantihose; see panties + hose (n.).

panty-waist (n.)

also pantywaist, "weak or effeminate male," 1936, from a type of child's garment with short pants that buttoned to the waist of a shirt; see panties + waist.