My wife’s opinion is that anything less than the complete truth is a lie, including white lies and including remaining silent.
Questions like "does this dress make me look fat?" or "does my butt look bad in this swimsuit?" are evidence of double-jeopardy. She doesn't approve of white lies unless the white lies involve HER. The prudent husband will respond, "not really, but I think that other outfit is far more flattering for you. I know I like it more when you wear it..."

On a serious note, I don't think
white lies are actually "lies" by deception or omission - but rather a diplomatic way of concealing, or coating, a truth. I may tell her that we're going somewhere when, in reality, we're going somewhere else for a far better reason: but it's a surprise. Or, perhaps, that I didn't even think about our anniversary being today - but then she opens our newspaper to see a large ad in the classifieds about how much I love her and I love being married to her.