Dustin Silver Knight Armor is crafted with Blacksmithing in Mabinogi (armor). This page lists everything needed to make it, checked against the game as it exists today. The interactive planner lives in the Blacksmith Companion.
How to get the manual
The manual is rank 1 and survives 30 uses; every crafting attempt spends one use.
Fleta: wandering NPC. Sen Mag Plains crossroads, morning/afternoon/evening windows (274,000 gold).
Materials
Expect about 10 attempts per finished item (10% average progress per attempt). Per-attempt materials are consumed on every attempt; finishing materials once per item.
Each attempt uses
15× Iron Ingot — refine from Iron Ore (common low-rank Refining output)
5× Fine Leather Strap — weaving rank 6 on a spinning wheel
5× Finest Leather Strap — weaving rank 3-1 on a spinning wheel
Finishing (once per item)
4× Finest Fabric — weaving on a loom, higher rank
4× Finest Silk — weaving on a loom, higher rank
1× Siren's Glasses — Siren monster drop in Rundal Dungeon