See that white on the dress? yeah, that left purple and violet stains on her tanned skin. Not even all white things are safe and a lot of it will come down to material.
I've found this really is a matter of trial, error and chance.
If you want her to to able to wear anything she want's then body stockings will be needed, as others have said.
You may need to pay attention to your own clothing, too. It is possible to cause stains from sitting together on the sofa. Those new indigo jeans you may be wearing can transfer colour onto her bare legs/arms/hands and so on.
eco