I usually do these IC, but I'm rather pressed for times these days, so let's just do one quick and dirty.
I would need a gambeson that comes to about a couple of inches above the knee. The outside material should be vlince (colored burgundy red). Beneath the outer layer should be a riveted chainmail made of mythril if the price allows it. And the final inside layer should be sifan, again if the pricing allows it. Additionally, as if this isn't enough a pain in the ass to calculate I reckon, it would be great if each forearm is reinforced with a solid metal plate on top, again mythrill if pricing allows it. Buckles and straps on it should also be vlince/mythril. Lastly it should be quite tight fitting, so one should be able to wear heavy armor over it (this is note purely for continuity, so that it's clear I can wear my heavy armor over it should I choose to, which is perfectly in tune with how the gambeson was worn in real life).
I'm not entirely certain how much such a thing would cost. Could be way out of my price range, so feel free to drop the materials a couple of tiers if necessary to fit my GP amount.
Submit Thread for Judgment