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The biggest part of the reasoning behind the length of the pockets in our jeans and pants is the simple anatomy. Men are built larger than women, it's in the "genes". The size of our pockets have to fit the size of our jeans, think about width, you already have pockets pretty much all the way around the jean, but if you're in a size 8, that's still only so much around. the length of our pockets should be no longer than our fingertips, therefore the mass-produced jean is averaged. If the pockets are too deep you would be bending funny to reach. Look critically at the jean style you typically wear, is there really room for a bigger pocket? If you really want to carry everything in your pockets, maybe you need to consider a different style? cargos?

and there's the fashion pattern lesson of the day, I'm sorry if that was way more than you wanted to know, you actually asked something that I know a ton about