It's too bad we don't have a Childe because I found him a dress for the ball. ETA also found Liber another option
Not that I'd expect him to wear a dress, but I'm just saying: 
new venti option
the above as the full set
detailing (obviously chest would be different)
more detailing
boyfriend voice: you look great in all of them
Depends on how elaborate you want to get!
they all look good
mid ball costume swap
I was thinking costume swap yes
also
g'raha poking nic like "let me take on the hero-ing for a while."
nic like sure you can be the hero