Balmoral boots employ closed lacing as opposed to Derby boots which have open lacing. Button boots use buttons.I was under the impression that these are called Balmoral boots.
What a great snapshot of stylistic eccentricities and details: two button sleeves, three; standing collars, rounded ones; two stripes with dinner jacket; no stripes at all. I wish I was there!
I do not think those are crossover ties. They look to be bowties but under the collar look like two crossed ends.I noticed that two chaps in the front row are wearing those odd cross-over ties (don't know what they're called) - I always thought those were a relatively recent (60s-70s) invention.