A very happy National Hat Day from Swim Daily to you!

Stewart Shining/SI

Happy National Hat Day!

Didn't know today was such a special day? Fear not, there's still plenty of time to pick out your favorite headgear and celebrate.

In the meantime, we're inviting you to take a look back at some of our favorite Swimsuit shoots that involved...you guessed it, hats!

Heidi Klum

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

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Throwback Thursday: Petra Nemcova's 2002 rookie shoot in Brazil