What's the difference between black tie and formal? Semi formal and casual? Here, we break down the top wedding guest dress codes, so you can be stylishly outfitted for the occasion. Click the link Why Black Tie & Formal Dress Codes Matter What Does Black Tie Optional Wedding Attire Mean? A Guide To Black Tie Dress Code For Women John Lewis & Partners Black Tie Preferred Dress Code Expert Approved Breakdown Of The Black Tie Wedding Attire Dress Code With Examples