What to Wear to a Black Tie Wedding Knee Length Wedding Guest Dresses Bridelulu Thoughts on a (mid thigh to right above knee length) blazer dress over a (full length) sheer skirt for a semi formal, indoors, fall wedding? Similar to the image : r Weddingattireapproval Thoughts on this dress for formal wedding attire. The one I bought is identical but is longer, stopping about 3 inches below the knee. : r wedding Every Wedding Guest Dress Code, Explained Wedding Guest Dress Code Breakdown Not sure what to wear to your next wedding invite? Here's a quick guide to help you decode the dress code & show up in style!