Be honest.
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Pants, about once a season because the cuffs get muddy in the spring.
Jacket, never.
Gore Tex says you are supposed to wash your jacket every so often.
Since when do you follow directions?
Regardless of instructions I find washing ski stuff always ruins the waterproofing.
So never.
Clothing like jeans and sweaters not only don't need to be washed after each wear, it's actually recommended that you do not.