If your stride and pace were exactly the same, your speed would be the same, so one of those has changed. Even a very slight variation in the length of your stride or your speed would make a difference over the entire length you're walking.
My guess is that the longer clothes are more constricting, and have therefore decreased your stride length a bit, so each step covers just a bit less distance. Even if your pace stayed the same, this would have an effect.
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