Celebrate National Hat Day with SI Swimsuit

Heidi Klum

Stewart Shining/SI

Argentina, SI Swimsuit 2002

Petra Nemcova

Walter Iooss Jr./SI

Brazil, SI Swimsuit 2002

Jessica White

Stewart Shining/SI

Portugal, SI Swimsuit 2010

Molly Sims

Stewart Shining/SI

Argentina, SI Swimsuit 2002

Monique Moura de Carvalho

Walter Iooss Jr./SI

Brazil, SI Swimsuit 1978

Petra Nemcova

Walter Iooss Jr./SI

Brazil, SI Swimsuit 2002

Oluchi Onweagba

Walter Chin/SI

Memphis, SI Swimsuit 2007

Isabeli Fontana

Stewart Shining/SI

Argentina, SI Swimsuit 2002