Quick newbie non-rev question as the fam heads out on a trip tomorrow. Buddy-quette says "relaxed" dress code. Clean jeans and sneakers OK even if they get upgraded?

We're pretty conservative dressers in general and everytime they've traveled before even the kids have been in what would qualify in the FOM for business attire. But this time it's to a very casual destination and we're trying to pack as light as possible. I'm going in jumpseat-legal clothing just in case, but I figure no reason to pack another set of clothes and shoes for everyone else if not needed.