triubhas

Trousers comes from Scottish Gaelic triubhas (also Irish triús), via an intermediate English form 'trews' or 'trows,' through a process of linguistic expansion that is still not entirely explained. The Gaelic triubhas named a specific garment: close-fitting leg coverings, often of tartan cloth, worn in the Scottish Highlands and in Ireland as an alternative to the belted plaid or kilt. The word may have earlier roots in Old French or Norse, but its immediate source in English is Gaelic. 'Trews' entered English in the sixteenth century as the direct borrowing, retaining the garment's Highland specificity. 'Trousers' appears later, from around 1580s onward, as an expanded form — possibly influenced by the English 'drawers' (the undergarment word) or simply by the phonetic habit of adding syllables to make foreign words more pronounceable.

The garment itself occupied a contested position in Highland dress culture. The belted plaid — the ancestor of the modern kilt — was the garment associated with Highland masculine identity, and triubhas were sometimes seen as a concession to Lowland or English fashion, worn for riding or for occasions when the plaid was impractical. After the Battle of Culloden in 1746, the British government's Dress Act prohibited Highland dress including the plaid and the kilt, but triubhas were permitted, being judged less distinctively 'Highland.' This created the irony that the garment associated with accommodation survived the political suppression while the garment associated with resistance was banned. The Dress Act was repealed in 1782, by which time 'trousers' was already entering general English use as a term for the emerging fashion of full-length, bifurcated leg coverings.

The eighteenth century saw a wholesale shift in European male fashion from the knee-length breeches that had dominated since the seventeenth century to the longer trousers that became the standard male garment by the 1820s. This shift was partly driven by the Napoleonic Wars, during which working-class and military styles influenced civilian fashion, and partly by the Romantic valorization of manual labor and utility. English needed a word for this new garment, and 'trousers' — already present in the language via the Gaelic borrowing — expanded from its specific Highland meaning to cover the new general garment. The Gaelic word for Highland leg coverings became the standard English word for the dominant male garment of the modern era.

The British English 'trousers' and the American English 'pants' cover the same garment with words of entirely different etymology. 'Pants' is an abbreviation of 'pantaloons,' from Pantalone, the stock character of commedia dell'arte who wore exaggeratedly long trousers — a Venetian word of theatrical origin. The same garment thus has a Highland Gaelic name in Britain and an Italian theatrical name in America, a split that reflects the different cultural routes through which the modern trouser form arrived in each country's vocabulary. The triubhas of the Scottish Highlands and the pantaloni of the Venetian theater have been competing to name the same garment ever since.