Old fashioned? possibly... but timeless? definitely.
That's it! - Timeless... that's what it is!
The time signature changes keep it interesting. I'm curious whether it might make it more of a feature if there were fewer of them - i.e. for some of the "Cornflower Blue" lines, to skip the count of 2 at the start of the line, and for others to keep it - maybe keep it for the first of each pair and lose it for the second of each pair... Just a pondering...
Love where the guitar gets a bit jangly just before the instrumental, and then I totally love the instrumental.
The mix of vocals is superb.
Very lovely, nice gentle summery sound. Added a bit of warmth and brightness to my November evening!