I also gravitated towards this look. It's just a classic white button-down with khakis. But I think the lace camisole gives the man's shirt a soft feminine vibe. And the knotted belt (vs. the traditional inside-the-belt-clasp) gives it a nonchalant hard element.
And finally, this striped shirt with the orange cuff.
Don't these little details give classics a chic subtle twist?