Final answer:
A life jacket should be replaced for safety reasons, not because it doesn't match a swimsuit. Competitive swimsuit buoyancy can be verified through testing to ensure fairness. Personal safety and adherence to regulations are crucial in these scenarios.
Step-by-step explanation:
A life jacket should be discarded and replaced not because it no longer matches one's swimsuit, but rather for safety reasons. If the life jacket shows signs of wear and tear, is damaged, or fails to provide adequate buoyancy, it must be replaced immediately. One's safety at sea or while swimming is the paramount concern, and it's crucial to have a properly functioning life jacket.
In relation to competitive swimming, especially as seen in events like the Beijing Olympics, swimsuits were designed to avoid providing any buoyancy advantage. The rule against buoyancy is enforced to maintain fairness in the competition. Verification of this rule could be done through testing the swimsuits in controlled environments, ensuring they comply with international standards.
Overall, the replacement of wearable flotation devices is a matter of personal safety and regulatory compliance rather than aesthetic considerations.