Unless you are currently planning a wedding, a wedding dress will refer to a commitment you need to or have recently made to someone or something such as a diet, exercise program, etc. You should also ask yourself if you have made a commitment to yourself?
The condition of the wedding dress will reflect how well that commitment is going. If the dress is in bad shape, you may not be commited enough. If the dress doesn’t fit then this may not be the right thing or the right person to commit to.