Yeah you can get Yotsuyu dress, there are even mods for that but... seeing how Aymeric armor went there, I'd rather not. Most unique NPC's with those clothes were made in mind with those said clothes (Aymeric has longer neck and slimmer shoulders, and that's why his armor looks a bit dumb on any other character, that is "standart"), and as it was said, Yotsuyu barely moves, so her dress would look awful in combat (then again we already have those, like wedding dress or those fairytale).
And Yugiri herself has the problem of clipping weapons on her waist...

So well... I personally dont want to see this copypasta armor in game, and it's clear that they wont adjust it to fit our characters. Best one I got there currently in Hien's, and it's because the coat is short and made in mind with movement.