My two cents - we looooved it when she went all eastern boho on the India/Nepal tour.
Now, she goes a bit brit boho in lace and we all agonize.
The odds that she will wear at least one of any of these on any given day that any of us do not like are huge: a dress style/dress color/repeat dress/earrings/necklace or non necklace/bracelet/ring or none/shoes/coat dress vs. coat or vs. dress/hat or fascinator/hair down or up or pony tailed or...
And the dress itself: we can choose to loathe the color, fit, style, hem style, hem length, hem motion, neckline, waist, fabric, busyness, plainness, blockyness, designer, sheen, opacity, beading, lace (too often, too rare)...
These are all things I have read here as criticism over the years. And I do critique a bit myself.
But this dress at Ascot was no horror. It may not have been to all our tastes, but it was (on the up side) fresh and young. It will not change the world. It was a happy dress for a happy outing.
JMO