My team had a fundraiser to raise money for uniforms. We all wanted to look like a team, and half the team couldn't afford or couldn't get the money from there parents. So we had two car washes and are currently setting up a yard sale next week. Plus, My team is also a sponsored team, but were not fully sponsored, we just get discounts and free play at the sponsor's field in exchange for representing.
There's nothing wrong with playing in jeans, but Milsim player love their gear! unless i'm rebel forces, I don't wear jeans. Honestly, I've played in jeans before, and it's just not as fun and doesn't protect your legs nearly as well.