When your bridesmaid dresses have a waist sash or tie of some sort, you can choose to tie the ribbon or material in several different ways. One option is to do a box tie, which is also known as a box knot. It is easier to do a box tie on someone else than to try to do it on your dress, so you may want to assign someone to tie all of the bridesmaid dresses rather than leave it to each individual girl.
Align each piece of ribbon or material. Pull the ribbon or material to be tied so that it lines up to an equal length on each side.
Cross over. Take the right side of the ribbon or material and cross it over the top of the left side of the ribbon or material.
Create loops and weave. Take the end of the piece of ribbon that is now on the bottom and pull it up and over the right of the top piece.
Repeat the opposite to create loop and weave. Take the end of the top piece of ribbon and pull it under and through the loop. Pull it over the top piece and under the left piece of the ribbon.
Secure the knot. Take the right side and pull it down and through the right loop so that it is a bit loose. When passing through the loop, the end should go under and then over. Repeat this step with the left side except the end should go over and then under when going through the loop.
Tips
This type of know should only be used as decoration rather than in effort to secure someone or something.