Answer: innies

AnswerCrossword Clue
INNIESSome belly buttons
INNIESConcave bellybuttons
INNIESLint traps, perhaps
INNIESSome bellybuttons
INNIESSome navels
INNIESAlmost all people have them
INNIESLint collectors
INNIESThey're below some chests
INNIESMany navels
INNIESLint-collecting navels
INNIESCertain navels