So uh, I'm looking at getting my character some armour...
Gloryborn Feycraft Shadow Silk Gnome Twistcloth, with
Signature Crest,
Keel,
Fins and
Ysgardian Heartwire additions (the Keel being cloth taking a form much like a Bronze Dragon's fin, using the Fins as the spines).
There are a few things here that are going to need GM ruling, though I've tried to keep it all reasonable enough in both crunch and fluff:
First, AFAICT there's no RAW mention of whether you can use multiple equipment templates together. Many of them are incompatible in terms of the background restrictions they need to take them, but I don't see any conflicts between Ysgardian and Feycraft.Second, Shadow Silk mentions it can only be applied to cloth or leather, which Gnome Twistcloth certainly is (as is Sharkskin, but I think that might be too specific), but it only gives the prices for the basic core gear, and it's nonstandard, so it would need to be priced by the GM.
Third, "small sections of heartwire mail can be incorporated into chain shirts, chainmail, or heavy armor to reinforce vital areas." It doesn't say exactly this works; I'm picturing some extremely light and fine chain reinforcement, possibly light enough to be sewn into cloth armour, but again that's up to the GM.
Edit: Actually, never mind the Feycraft, a better idea has occured to me on that front. Mmmm, Eberron, you have such wonderful gear...