The first year we did this was for a table decorating contest. Each table for the banquet was given to a team to decorate however they wanted. It was really a cool idea. I found these shirts for like $2 each so we decorated ourselves as well, and thus a tradition was born!
We got my daughter in on it for Christmas this past year. Her mouth looks funny because she had the chicken pox. Can't wait to get matching dresses for my two girls in the future!