He was so focused on her pretty face that he didn't see anything else.
I don’t remember if she twirled before they left when she was showing her dress off in the mansion asking “how do I look”. He wasn’t really focused on the dress itself but how pretty she was so he never really noticed the back
i mean i could see that if it was subtle like i had pictured it jsut swooping a bit lower than he had noticed not like TO HER ASS like that's a dress you would gasp at in 2024!!!
these dresses are so scandalous. the dress is not at all how i pictured it but i'm glad i finally got an image to put to that scene! how he possibly could have gotten all the way to the ball without noticing her back is beyond me but...