The old school Pentacostal churches around here do not allow the women to wear pants. They also have to keep their hair long. But they won’t stop you at the door if you get a haircut.
Peer pressure. That’s how they keep you uniform.
I doubt if any of the old school Penatcostals would go against the congregation and cut their hair. That act would be too rebellious.
Everything we do, what we wear, what we drink is earthly and won’t save us one whit. But as Paul says, don’t let your freedom cause anyone to stumble (I’m paraphrasing, obviously)