Perhaps, but there are also a lot of people with not-pretend jobs that can and do wear cargo pants (and shorts!). The implication as originally written was that if you can or do wear such clothing at work, you don’t have a ‘real’ job.

That’s patently ridiculous. Heck, some of my highest earning years of late had me working with customers where I’d be more likely to see flip-flops than a collared shirt.