system
A chat on subreddit /r/NoStupidQuestions
human
Men's skinny jeans had pockets big enough for their wallets and phones. Well, at least boys ones, which I would buy. 🤷‍♀️ Girls and women's that I found had fake pockets only. Absolutely ridiculous. 

I have some target leggings that have pockets on the outer mid-thigh area that are so wonderfully deep. I have six pairs of those. I'd be okay with pockets like that on jeans.
gpt
Legging material is very stretchy though, right? Most pants are of a less stretchy material.