If you suffer from depression, anything that makes you feel has to the most important thing in your life, because it's the only thing that can save you.
What convinces is conviction. Believe in the argument you're advancing. If you don't you're as good as dead. The other person will sense that something isn't there, and no chain of reasoning, no matter how logical or elegant or brilliant, will win your case for you.
If you don't take your clothes seriously, why should your viewers take you seriously?