The only problem with the creme piping is that the seatbelt rubs over the edge and keeping the creme piping clean is a pain.
I would, if specifying again, reverse the colours, a light leather with dark piping.
If keeping the cream piping clean is difficult, why would you have cream leather, wouldn't that be even harder to keep clean?
Personally I feel the traditional colours like tan and mulberry (especially mulberry, I love Neilda's car) look best in traditional cars.
Cream leather to my eyes is all a bit "Considerably richer than yow", not to mention being wildly impractical unless a car is never driven top-down in inclement weather.
The problem is where the seatbelt rubs over the seat pipeing every time you pull the belt out to put it on, and when you move. I'll try and post a photo.
But yes, you have a point. And I agree that in certain cars, particularly large, expensive cars made in Italy and the Goodwood area, cream leather really says not just "Considerably richer than yow", but much more. It seems to be associated with things like diamond encrusted keys, an option from both Bentley and Ferrari...
Aldermog had black seats and in the summer the co-pilot complained that in the sun they were too hot for comfort. Tarka's seats don't get as hot in the sun. So lighter leather helps, but white leather I saw in a black Bentley looked, well, just wrong.
So a tan or grey is probably a reasonable compramise, whith either no or contrasting dark piping.