I’ve got no idea. I don’t really know how devs could get away with something like that. Just adding major assets to a game on their own time when nearly every change they make to the code causes new bugs. Idk.
There are a few exclusive driver suits. I render ages ago i made a post asking about one and it turns out the suit was added as part of another Microsoft product( a game maybe.) that people could buy.
What other promotional suits were available? I’ve managed to get ahold of a handful of them but can’t find a definitive answer as to what was released.
Pure Kick? Is that forum related? 
Ah the blissful ignorance from not knowing why something has its name.
It’s a sport/energy drink: PureKick.com …so this driver suit is promotional content.
Not to be confused with the Kick from Stake F1 Team Kick Sauber - which I admit that I kinda did for a minute there. 
Thanks for the links. Without knowing about Pure Kick it was a good laugh.
I have been seeing all kinds of different suits on the rostrum cut scene.
I just saw a red and yellow Reizei and a purple Turbopod.
The other day I saw an orange and white suit with Marshall written on it.
