Compliment this dress with the "classic" western hat and boots.  With this complete outfit, you will be ready to dance all night. 

Your groom can be fitted for the Western Wedding also.  A Western Tux would look quite handsome.  If your desire is for a more casual look, here is another suggestion for his attire.

         Black Jeans                                    Boots   
         Black or White Tux shirt                 Hat
         Black or Designed Vest                  Belt
         Black Western Sport Coat