First things first we prefer that you wear clothing. Undergarments are optional but we'll leave that to your discretion as your own little secret ;) The attire is semi-formal meaning: suits or nice slacks button up shirts, dresses etc. We do prefer colors that are earth tones. We don't have an official wedding party because YOU ALL are our wedding party- so it would be awesome if we all wore something slightly cohesive to make our photographer happy. These colors include: brown, forest green, tan, beige, terracotta, mustard yellow etc.