(Observed and tested with patch Y)

1. Join a server
2. Join race
3. go to Options->player and change model and helmet skin
4. Observe that the driver model is updated immediately, but the helmet skin remains the old one.

Having a look at the mpr data i recognize there actually is a package describing the new model and the new helmet skin. But the new helmet skin is just not applied:

The Orange part is the changed driver model, the greenish part is the new helmet skin (hex for "Injext_PRO_B").

I admit that it is questionable if changing model and helmet while in-car should be possible at all. But the current implementation is inconsequent - Either none should work or both

Replay is attached. Just use Shift-U to watch the driver - The model changes from male to female, but the helmet skin stays the same, although the new skin is "Injext_PRO_B".

Btw: When the driver of a car is changed in-game (using the "T"-Button) the model AND the helmet skin are changed correctly