Which uniform requires an undergarment that completely covers the breasts?

The requirement for an undergarment that completely covers the breasts pertains specifically to the women's wrestling uniform in the context of maintaining proper athletic standards and ensuring modesty during competition. Women wrestlers are expected to wear appropriate undergarments that adhere to these guidelines to provide support and coverage.

However, the inclusion of men's uniforms in the answer indicates that attention is brought to uniform standards across both genders in wrestling. In wrestling, while the focus on undergarments primarily relates to women's uniforms, the overall uniform regulations apply to both men and women, emphasizing the importance of appropriate attire for all competitors in the sport.

Thus, the answer indicates comprehensive coverage requirements across genders, reinforcing the idea that proper wrestling attire is crucial irrespective of the wrestler's gender.