Spicing up formal wedding suit

My wife wants me to wear my dark grey "business" suit to a formal wedding in Florida. What shirt, shoes, pocket square, tie options etc. can I do to make it a bit more fun and interesting?

This is the suit: https://suitsupply.com/en-us/men/suits/dark-grey-houndstooth-tailored-fit-havana-suit/P6926.html

Shop the Dark Grey Houndstooth Tailored Fit Havana Suit in Pure S130's Wool at Suitsupply. Enjoy FREE delivery and returns on all orders.