For ladies semi-formal would be classified as midi to floor-length dresses. For gentlemen, it would be classified as a suit with no tie or a long-sleeved dress shirt with a tie and dress pants. I have some picture examples for clarification.

We kindly ask that you wear solid neutral colors such as black, grey, brown, taupe, etc. with no prints or patterns. Please nothing too light or close to white.

We ask for no jeans. We want you to dress up with us!