Ruth Satin High Tie Neck Backless Floor Length Dress Pink 2 Is an open back dress appropriate for BTO (Black Tie Optional)? : r Weddingattireapproval OnThisDay Ten years ago a great dress color debate was born! The dress became a viral phenomenon in 2015 with social media torn on whether the dress was blue and black or ELI5:Why does this dress appear white gold to some people and black blue to others? : r explainlikeimfive