A kind person sent me an email to point out that it was the demi-soloists who have the bejeweled helmets, not the corps members, who wear the butterfly clips:
I like the idea of the soft tutus much more than the implementation, especially since they're cut above the knee. They don't seem to be this or that. I've never been a great fan of most of Karinska's designs, though.
POB managed beautifully with slightly soft formal tutus for "Diamonds," but the stage at the Bastille is so huge that when they do the last act of "Raymonda" as a stand-alone, it looks like none of the guests arrived for the wedding, and in "4 T's" Melancholic looks like he's doing his solo in the middle of the ocean.