After the prayer, I found a tear in my clothes; do I have to repeat the prayer?

A man's 'awrah is from the navel to the knee. If the tear in the garment does not expose any part of the 'awrah, then the prayer is valid. If it does expose a part of the 'awrah, then if it is a small amount, the prayer is valid. However, if a large amount of the 'awrah is exposed, then the prayer is invalid and must be repeated within its time.