Vanson makes a leather Jacket with “Solar” white leather that collects sun light during the day and glows faintly green at night. Got to be better than flat black, but it appears that it is rather cheap looking leather, not at all the quality image you expect from Vanson.
They warn you, it seems, on every page of their website.
I use leather cleaner by Lexol, on all my leather. Boots, Jackets, Belts, but it just cleans and moisturizes the leather. Not sure it would resurrect light leathers. Not sure it’s available across the pond. Note that this is LEXOL CLEANER not Lexol leather treatment. (Yes I use Lexol leather treatment, too).
I’ve got black and white leather gloves and the white never stays clean, even on the back of the gloves. I also have a textile waterproof jacket I wear over my leathers with white panels in and that also always looks dirty, but at least even dirty it does make me more visible.
I guess white will never look clean when it’s outside.
