Perhaps North America is evolving its own Highland Dress conventions? Climate cannot be dismissed, either.
Consider that tweed is more scarce on this side of the pond. Tweed at a wedding or funeral simply does not enter many peoples minds (muchless a kilt) on this side of the pond. Not debating the validity of either perspective. Just a few thoughts.

My advice is (borrowed from another post):
Wear confidence. It fits the best and suits any occasion. (Pardon the pun.)

BTW, Nathan, well done. I would wear any of those styles in your photos without batting an eye.