Instead of some leather plastic like stripes on the chest, an energy trim that glows will be a lot more elegant and expensive looking. Enery trim based on energy colour.

I main Excalibur and have bought 3 tennogen (helm, skins) for excalibur alone, I will surely buy this if it got more energy trim because based on my experience, no matter how pretty the design is, many times in the mission you wont see it unless you got some energy that glows in the dark. For example, Caduto is a great skin because of this, not just a skin, but it looks like an upgrade to excalibur.