This may be not the first time asking for models like this so sorry in advance.
We already have princess Peach, Daisy & Rosalina in their regular dresses (except the sitting version of Rosalina but who cares). But they also have other outfits in certain games like sports games. We have some of them already but they’re either old, broken or incomplete. Here’s a list:
Rosalina: https://www.models-resource.com/wii_u/mariokart8/model/10576/ - There’s already a port but it’s hard to pose and very low-poly.
Peach: Already ported; only faceposing missing.
Just wanted to mention that. Would be just nice to see them in GMod soon.