I'm a bit overweight and I never bike in jeans as they are way too hot and sweaty. Plus I find them stiff and that they restrict movement.
I actually think it is more "budget conscious" to get sports clothing designed for cycling, or even some casual clothes that are specifically designed for cycling eg.
https://hiconsumption.com/2015/09/be...commute-pants/, because they won't wear out as fast.