Wearing World Champ Jersey in races

[avanti]

Are both the under-23 and the elite world champions both allowed to wear their world jerseys in the same race (e.g. TdF)?

 

[Ferminal]

Are both the under-23 and the elite world champions both allowed to wear their world jerseys in the same race (e.g. TdF)?

u23 riders who graduate to the professional ranks the next season are ineligible to wear their rainbow stripes (see Sicard, Bobridge).