"twilled cotton cloth," mid-15c., Geayne, short for Gene fustian, from French jean fustian "fustian (a type of twilled cotton cloth) of Genoa," the Italian city, from Old French Jannes "Genoa," from Latin Genua (see Genoa). Compare obsolete jane, name of a small silver coin of Genoa that circulated in England 15c. The plural form jeans became standard by mid-19c. In the sense "trousers made of jeans" it is attested by 1908; noted as characteristic of teenagers from 1959. Not originally blue.
After sheep could be protected from the wolves, the people fared better in the matter of clothing. Flannel and linsey were woven for the wear of women and children, while jeans was woven for the men. For want of other dye-stuffs, the wool for the jeans was almost invariably colored with the bark or young shoots of the walnut; hence the inevitable "butternut" worn so extensively in the West for many years. ["History of Menard and Mason Counties, Illinois," 1879]
1570s, "cotton padding," corrupted from earlier bombace "raw cotton" (1550s), from Old French bombace "cotton, cotton wadding," from Late Latin bombacem, accusative of bombax "cotton, 'linteorum aut aliae quaevis quisquiliae,' " a corruption and transferred use of Latin bombyx "silk," from Greek bombyx "silk, silkworm" (which also came to mean "cotton" in Medieval Greek), from some oriental word, perhaps related to Iranian pambak (modern panba) or Armenian bambok, perhaps ultimately from a PIE root meaning "to twist, wind."
Also from the same source are Swedish bomull, Danish bomuld "cotton," and, via Turkish forms, Modern Greek mpampaki, Rumanian bumbac, Serbo-Croatian pamuk. German baumwolle "cotton" probably is from the Latin word but altered by folk-etymology to look like "tree wool." Polish bawełna, Lithuanian bovelna are partial translations from German.
From stuffing and padding for clothes or upholstery, meaning extended to "pompous, empty speech" (1580s).
Bombast was originally applied to a stuff of soft, loose texture, once used to swell the garment. Fustian was also a kind of cloth of stiff expansive character. These terms are applied to a high, swelling style of writing, full of extravagant sentiments and expressions. Bathos is a word which has the same application, meaning generally the mock heroic—that "depth" into which one falls who overleaps the sublime; the step which one makes in order to pass from the sublime to the ridiculous. [James de Mille, "Elements of Rhetoric," 1878]