A wedding is one of the most awkward challenges for someone who desires Not To Be Seen.
So many distractions...brides, bridesmaid, family, vicars.... there's no obvious way to blend into the background. However...
Agent 17's secret is the Paint Explosion Camouflage pattern dress, matched with the "What Were You Thinking?" wedding hat. Available from BigCo...your brand leader is sarcastic snideness.
Bonus : Iron and Wine.