Diaper removal during sleep

My son is pretty regularly removing his pants and diaper... and sometimes his shirt during his nap time and even overnight! He seems to wake up - quietly strip and then go back to sleep! This even includes those footie pajamas that are pretty tricky to unzip and remove 😬 any tips?! Anyone else doing this? About 50% of the time he’ll have peed or 💩 in his crib!! 😰

Baby #2 will be here next week so I’m not ready to transition out of the crib or reattempt potty training! HELP!