My fine lady, here is your answer....sort of. This explains the "pair of pants" problem, but....did underwear used to come in 2 pieces too? LOL!
Originally, pantaloons were made as two separate garments, one for each leg, as a means of keeping the legs warm beneath a gown without interfering with visits to the lavatory, or as additionally layers to go over the legs of trousers, similar to 'chaps,' to provide additional warmth of protection. Eventually they were stitched together, but retained the erroneous title of a "pair of pantaloons," which ultimately became a "pair of pants."
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Originally, pantaloons were made as two separate garments, one for each leg, as a means of keeping the legs warm beneath a gown without interfering with visits to the lavatory, or as additionally layers to go over the legs of trousers, similar to 'chaps,' to provide additional warmth of protection. Eventually they were stitched together, but retained the erroneous title of a "pair of pantaloons," which ultimately became a "pair of pants."