It's acceptable as long as the pants are unnoticeable (like plain navy, dark brown, or charcoal trousers), but it's better if you give the pants a rest at least for 24 hours for longer lifespans.
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Is it okay to wear the same clothes every day? No. You can wear jeans and pants for multiple days as long as they are not dirty or smelly. Wear shirts or t-shirts no more than two days because they will definitely get stinky and dirty.
While it might be difficult to resist the perfect feel of wearing new clothes, it is recommended that any clothing worn in direct contact with your skin (especially things like underwear, t-shirts or shorts) be washed before wearing.