Couples that don't look good together; Do they have a chance?

I made a thread similiar to this one a few weeks ago but the answers didnt help me on this aspect of the former question.

Do you believe that people have to look good together to have a chance at a succesful relationship?
What is your idea of a couple that looks good together? That looks bad together? Did it make a difference in how long they lasted, how well they got along?
Do I seriously just need to stop thinking about the way people look and realize it has nothing to do with their personalities and chemistry and feelings for each other?
And most of all, should it matter that the boy I like doesn’t dress the way I do, and is skinnier than me?
I know I sound stupid and immature, but I’m serious here.