Here is some help on painting some British on black undercoat the devils undercoat.
https://www.youtube.com/watch?v=adqXclE4_iQ&t=305s
Agree it can be Les!
Brown and grey as well as white are great alternatives.
More hints and tips for American light cavalry.
https://www.youtube.com/watch?v=K7OQMiCh8qI