Yet they never buy pants with pockets and many other kind of practical clothing that would make their life easier. You can't just listen blindly; you need to look at what they do.
Now if you look at the younger generations, you will find some girls wearing that kind of clothing.
But if you look at an elevated level on how things work in society, women derive a lot of their power from how they look, how beautiful they appear to be. As the girls become adult whether conscientiously or not, they internalise this and start to dress in a way that maximise their power.
If they really wanted there is nothing preventing them to wear men pants that are gender neutral. But they don't because they would lose much more than a few pockets. They do not really need them anyway because even the most rugged women will have some sort of handbag.
Because it is one more fashion accessory to show off, because you can carry even more stuff than any pocket would allow and because this way, they don't have to choose between looking beautiful and being able to carry stuff. If anything, women carry around way more stuff than any man could in his pockets.
On the other hand, men handbags are not a thing and not just because of fashion or social pressure, but because they are very likely to be asked to do things that require them to have mostly free movement (like carry stuff, hold doors, fix broken things, etc...). A friend once joked to me that he mostly wore strong jeans because he is highly likely to be asked to go down on his knees to fix whatever his wife (and other women) point at him.
If you look at one subset of men who derive power from looking beautiful/successful like salesmen, they also dress in a way that is not very practical for most daily activities. A suit has pockets, but mostly in name, they are very weak and shallow and leave disgracious bulges from whatever you are carrying that is not a small item like a simple key, forget about putting a modern smartphone in those pockets, it will not last long (in fact I have been scolded by women about how the stuff I was carrying in my suit pockets made me look bad and how I was ruining the suit). They do it, because just like women, they derive a good amount of power from dressing this way. The major difference is that this power exists only during their work so they very rarely dress this way outside of work, the little power advantage they would get in day-to-day life is not worth the trouble (and added cost). Women on the other hand benefit from this power throughout daily life even in their own home in some cases.
It is tiring to always hear about how women are victims of many choices they make themselves; precisely because they are capable of rationality just as well as men (the difference is mostly in usage), and those choices are generally about maximizing their profits.