As much as I love the headcanon that Noelle would give Ralsei some of their old dresses and skirts (and sometimes that Ralsei would also give Noelle her more "masc" clothes) because of all the awesome solidarity, I can't help but feel like it'd be important for them not to do that? Like, Ralsei's arc is mostly about crafting her own identity and finding what works for her, which is why I don't think that Noelle, a character who also struggles with repression and the expectations everyone else pushes on them, should give her their old clothes. Same thing when it's both of them swapping clothes. To me it just feels like they would be rejecting their oppressive roles just to adopt new ones that are also toxic.
So. I think both of them should go on a shopping spree instead. With Carol's money. Unsupervised.
Also I just don't think Ralsei would like Noelle's Christmascore aesthetic.