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