Actually, the leine as clothing of aristocracy argument has been a bit outdated (though it still floats around a bit). 'Aristocracy' generally came to mean anyone who wasn't a saer-stock (slave) or daer-stock (temporary slave). However, I know Norse-Irish were considered 'unbecoming' of wearing a leine (that would be, Ostmen mercenaries, some still wore it anyway, but in Irish service they were usually disallowed), and still wore trews (though St. Gorma says that they sometimes combined a leine and trews in Dublin, due to their misunderstanding of the culture).
However, this may be a chance for a skinning difference; the Dal Riadans/Scots did still consider the fiennach (freemen, but not wealthy) below aristocracy, and they did wear trews (but often with a leine, solely because of how cold the region was). Since trews are skin tight, it should be easy to skin them on the same model (I hadn't thought of it before, as I often forget that trews were still in use until about 1050, afterwhich we see almost only bare-legged Gaels). The only other unit that would have trews would be the Scottish variant of Soikernbannal in that case, and probably the Ostmen.
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