I found this image in the files, but I have no idea what route I have to make the protagonist go through to get it, help would be appreciated

Doll Sarah, take her to floor 11 and you get the out fit out of the chest, once you go through all her scenes, choose to keep it.

The joints are different then in the doll route, I use to know how to get that one but it's bin so long sins I did it that I forgot. Sorry for not being more help.