Celebrate National Hat Day with SI Swimsuit Author:SI StaffPublish date:Jan 15, 2015 Heidi KlumStewart Shining/SI Argentina, SI Swimsuit 2002 Petra Nemcova Walter Iooss Jr./SIBrazil, SI Swimsuit 2002 Jessica WhiteStewart Shining/SI Portugal, SI Swimsuit 2010 Molly SimsStewart Shining/SI Argentina, SI Swimsuit 2002 Monique Moura de CarvalhoWalter Iooss Jr./SIBrazil, SI Swimsuit 1978 Petra Nemcova Walter Iooss Jr./SIBrazil, SI Swimsuit 2002 Oluchi OnweagbaWalter Chin/SIMemphis, SI Swimsuit 2007 Isabeli FontanaStewart Shining/SI Argentina, SI Swimsuit 2002