About the Caprice hair, looks good but I dont think its that one I'm starting to think that the guy on twitter did the dress and hair himself, he also has Anna's hair from Frozen 2 for DAZ if you look into his works I think he did it himself too, maybe he won't share...
He says he uses dazstudio, I dont have twitter, but if you guys want to try asking in the comments, maybe the dress he did it himself don't know about the hair tho