Usually after a few days at the beach, my husband develops a rash on his belly in the area of his swim trunks waistband. Last year, I brought some diaper rash cream as some had suggested and it did help with the discomfort. We would like to avoid it happening in the first place and are looking for suggestions. I thought this year we would pack 4 pairs of trunks. One for morning and one for afternoon and a dry set for the next day while the others dry. Would tucking in a swim shirt help? We're open to suggestions. Thanks in advance for your advice!