TCS caught a lot of flack with their first Winter Tiger I, because the tricolor camouflage showed through the white wash too much! Brian even repainted some customers Tigers for them, as I recall.The later larger Winter Tiger I had the thicker white wash.
The first version was technically correct, as the water based white wash was applied over the camouflage and would start to fade with time and weather, revealing the colors underneath. The TCS Winter Panther, Kingtiger and Stug III also had thin winter white wash.