Navels never or very rarely exposed of female supermodels of the '60's & '70's?

Hello –

Sorry if you find this weird, but I’ve heard that the following female supermodels never or very rarely showed their navels (belly buttons) during their careers, possibly because they have outies or rather unusual navels that they’re ashamed of –

Liz O’Brien, Pam Suthern, Kelly Harmon, Nancy Stafford, Gleo Clyde, Linda Hutton (not Lauren Hutton), Lynn Brooks, Melinda Culea, & Gail Kendrick