How does disney indicate age suitability on clothing?

The single source supplied is a biographical entry for Hilary Duff and contains no information about Disney’s policies or practices regarding age suitability labeling on apparel. Without additional references or documentation that specifically addresses Disney’s clothing labeling conventions, it is not possible to provide an accurate answer. To learn how Disney marks clothing for specific age groups, one would need to consult official Disney merchandise guidelines, retail packaging, or corporate communications that discuss age-based labeling, none of which are present in the provided evidence.