I work in an office and we do not have a strict dress code. Dress down days are more often than not. But, we do have some rules. If you have a meeting in or out of the office with a client or vendor - you must dress appropriately. Other than that, you dress to match your task. I sometimes have to move around toys and help load a vehicle to get toys delivered or help unload donations. So nice jeans on most days are fine. I think it actually helps with good office morale.