Marco, Polo

So, I'm heading to a polo match in West Palm Beach Sunday and I have absolutely no idea what to wear to a JANUARY polo match.  The weather is sunny and in the 70's and that leaves me completely clueless as to what to wear! 

I'm thinking a cute dress with a blazer and flat sandals or colored skinny jeans and a button up with flat boots.  But, I have about 4 possible options I'm going to stuff in my carry on!  If only it were a spring month, my options would be so much greater!