South Africa model Genevieve Morton burst onto the pages of SI Swimsuit in 2010 and has been a mainstay ever since. Like all SI Swimsuit models, she also underwent a fitting of various bikinis to see what fit best and would be included in the issue. And luckily for us, swimsuit editor MJ Day held onto those photos for this week's installment of "From the Vault."

MORE SWIMSUIT FITTINGS: Leryn Franco | Nina Agdal | Anne V | Alyssa Miller | Chrissy Teigen