Fashion exclusive "trick"

Didn't "discover" it, saw Sakeno_Mikoto with it applied, then figured it out

Apply an outfit with a cape on it, (that also lets you tweak most of it) now just put a cape on top, you'll notice the one from the outfit doesn't go away

Also keep in mind there's at least one thing that you can equip from the outfit section that isn't available otherwise on the corresponding category, I'm referring to the black long haori with white stripes, don't know if more like that exist

If it was well known, or someone else already mentioned it, I'll just go fuck myself