And I've figured out why those work pants I got were so cheap. The front pockets are kind of like jeans pockets where they're on the inside and they're really tight, and the one side pocket they have is only attached halfway down, the bottom half just flaps around freely.

These things would be annoying for someone on a job site that's actually using the pockets on their trousers constantly, but it's fine for me just in an office all day. The only annoying thing is that leg pocket can flap around when pedalling on the bike.