Assuming your question was serious...
- Why shouldn't he change "kit" for just one event (if he's participating)?
- If event's arm band is changed to yellow for looigi, what about those with yellow "kit"?
- "In some cultures the wearing of a black armband signifies that the wearer is in mourning or wishes to identify with the commemoration of a comrade or team member who has died. This use is particularly common when a group or team meets after having lost a member." http://en.wikipedia.org/wiki/Armband