Original not required, but please check it out here!
Technically could be considered for both Echo and Resonance, but I shaped it with clearance for Resonance's midsection in mind. Should work alright with any tight-fitting bottoms; the model is wearing Eremm's Pumpkin Queen.
Some minor clipping may occur with certain idles/animations/C+ scalings/etc, along with some separation of parts in extreme poses. C+ is on in preview. Let me know if there are any major issues, otherwise I hope you enjoy!