Is it required that any visible garment worn under the jersey or shorts be a solid color?

In soccer, there is no requirement for visible garments worn under the jersey or shorts to be a solid color. Players are allowed to wear undergarments that may have patterns or designs, as long as they are not in colors that may cause confusion or could be mistaken for the opposing team’s colors or the referee's uniform. This flexibility allows players to express individual style while still adhering to recognition and visibility standards on the field.

The other options imply restrictions or conditions that do not align with the established rules. For instance, the notion that only the home team must wear solid color undergarments does not reflect the reality that both teams may have varying styles in their undergarments. Additionally, the option that suggests it is only at the discretion of the referee is misleading since the rules are generally consistent regardless of individual referee preferences.