I always try to fix ‘n’ sow together my mom’s red scapular. So, maintenance and replacing damaged things is key, in my opinion. I’ll do the same with my brown scapular, when the time comes.
But, if it were to ever be severely damaged, I’d consult a knowledgeable Carmelite about it…since I wear the brown scapular, because that order could have its own special tradition or something, on rightfully ridding of the brown scapular.