Green Eyed Blonde,
Quite a bit upthread we dwelled on this piece of cloth ivy, and whether we thought it came from Chelsea's costume or not. I think it was BDE (?) who showed a closeup of a pic of Chelsea at the party, and you can see there are indeed two shapes of ivy that she used. The ivy around the bodice was different, IIRC.
This being said, I really don't think LE would have commented on the find, or the ivy in particular if they weren't pretty darn sure this is Chelsea's.
But that is just an opinion, of course.