I would like to know if big inside cuffs are only used on pleated dress pants to add more weight and thus have a better drape or if it can (or should) be used in chinos as well?
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I've noticed generous hem allowances like this on trousers of all styles and always assumed it as a mark of quality—more fabric not only therefore more expensive but also of course provides for prospective alteration, and also the weight–drape benefit you mentioned.
Obscure example, David Nightingale Hicks (lighter-weight trousers—more hem allowance?):
And less obscure, G. Bruce Boyer: