Look at the vid, when the Jaguar is ready to jump with the driver, it has normal windows.
When it jumps, it has black windows
There are 2 stigs : the black and the white
Top Gear made the first die cause his name was found
2 Stigs are still alive
The first is called Perry McCarthy, Formula 1 ex-driver :
Perry McCarthy's biography
Perry McCarthy on life as ‘The Stig!’