lily-white 
adjective
1Pure or ideally white: her lily-white hand...
- The girl was soft, lily-white, as pure and chaste as they came.
- A swan is also not quite as lily-white as you'd expect - he has some black feathers and a little bit of accumulated grime.
- One of the students who did not leap to attention however, was sitting in the furthest corner at a paper-strewn desk, her head was lazily propped upon one slim lily-white hand which rested just beneath her pointy chin.
1.1Without fault or corruption; totally innocent or immaculate: this was not a game he should have entered if he’d hoped to stay lily-white...
- They were all pretty much at least 18 by then, and apparently weren't all lily-white like their reputations would have you believe.
- It was always guaranteed to set Lo off, despite his claim to have lily-white hands).
- Were they concerned by Graham's less than lily-white reputation when it comes to financial propriety?