Vallejo has an entire color line called Panzer Aces that includes the base color, highlights and shadows for each and every possible WWII uniform. Including US tanker, USMC tanker, etc. They have the three Oak leave camo colors, splinter camo, SS black. It really is a great line, all the Allies and Axis covered for the 1/35 guys.

The Osprey books are cheap and will give you a good reference on just about anything in individual volumes.

I attached a couple of photos, one of a jacket, but two of a Sherman for you guys who don't think weathering is warranted.