How long must a fencer's jacket overlap the knickers when in the on guard position?

The correct length that a fencer's jacket must overlap the knickers when in the on guard position is 10 centimeters. This specification is important for ensuring that the fencer is adequately protected during competition. The overlapping area serves to minimize the risk of exposing the body to accidental hits, particularly in fast-paced bouts where movements can be swift and unpredictable.

In competitive fencing, there are safety standards that dictate how personal protective gear should fit and cover specific body areas. The 10-centimeter overlap is a standardized measurement that balances protection without hindering movement or agility. It ensures that the jacket remains securely in place, even during vigorous fencing actions, while still allowing for the range of motion needed by a fencer.

Regarding the other measurements, while they may seem like a thorough approach to potentially escalate safety, they exceed the standard and could be impractical. A 15-centimeter or 20-centimeter overlap, for instance, may restrict movement or lead to excess material that could become caught or hinder performance. Thus, the 10-centimeter overlap has been established as the optimum criterion in fencing regulations for a functional balance of safety and agility.