If you want to wear blue jeans, then look for schools that don’t restrict blue jeans. This will still leave you with plenty of options.
My kid only applied to schools that seemed to have pretty much no dress code other than avoiding indecent exposure. I’m not even sure if kid’s BS requires shoes except where necessary for safety reasons.
There’s even wiggle room there, depending on where you’re applying. I believe the general rule it to dress at least a degree more formal than the average student (unless the average student ignores the dress code).
If a school claims to be “come as you are”, and money is tight, don’t go out and buy a new clothes just to interview.