Final answer:
Wearing old shorts and a T-shirt to a wedding is considered malapropos due to the tradition of wearing formal attire to weddings.
Step-by-step explanation:
Wearing old shorts and a T-shirt to a wedding is usually considered malapropos. The tradition of wearing formal attire, such as suits or dresses, to weddings has been upheld in many cultures around the world. This is because weddings are seen as special occasions that require a certain level of respect and formality. Wearing casual attire to a wedding may be seen as disrespectful or inappropriate.