Congratulations on your upcoming Memorial Day wedding! As far as what color and / or style shoes to wear, the most conservative and dressy choice is a black, cap toe with closed stitching or a black slip on monk strap style. Black shoes won’t stand out. You can look at medium brown, cognac or butterscotch brown oxford and monk strap styles and see how they look with the suit if you want to look more stylish. However in my opinion black will probably be the best choice.