Capeliene fleece waistband is done - needs to be replaced

Capeliene fleece waistband is done - needs to be replaced

Hoping to change out a well worn elastic waistband on my capilene fleece long underwear. Not sure how to go about it but love that I have had them for a long while and want to try to resurrect instead of rolling them up which isn’t working so good. thanks ahead of time for the help.