Waistband height utility kilt

[Nemuragh]

Words are important because they convey a differentiation. A waist coat is not called a jacket because it is different. Breeches are not called trousers or is it pants in America? Shoes and boots are different so a Kilt is not a tunic.

Unfortunately for your argument, words have a way of twisting and squirming over time and place. See how ‘jacket’, ‘coat’ etc have changed over the years. Look up the etymology of ‘shirt’ and ‘skirt’. Even the example you specifically mention - ‘trousers’ and ‘pants’ have different meanings in different places.