When I see a slim guy in a big pants

1. I may not want him to change the pants, because it brings me amusement.
2. He may not want to change, because he is trying to gain weight
3. The big pants may be used to transport drug or smuggle immigrants

The list can go on, and that is the beauty beyond reasoning. Science is just one of the possibility.
If you read Shakespeare, you would not say simple is beautiful. Simple can be beautiful, but simple is not all.