Love is color blind

They say cats and dogs are color blind, but i always wonder if our pets notice when we change clothes? Obviously they aren't going to notice the difference between your various pairs of blue jeans, but what if a goth chick all of the sudden woke up one morning and put on all white? Would her cats freak out at the stranger in their house? A cat might not be able to tell the difference between dark red and dark blue, but they CAN'T miss the difference between black and white...