OR
NO, sorry. They all zip down the outside, unless you find a 40 year old pair, or get some without a zipper and put one up the inside of one leg and down the other. I have noticed that sleeping in down pants is not nearly as warm as one might think because the legs are separated by so much insulation that they don't form one warm area inside the bag, but rather two.
Jim
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These are my own opinions based on wisdom earned through many wrong decisions. Your mileage may vary.