Terra Ancient Pattern Wear is crafted with Tailoring in Mabinogi (clothes). This page lists everything needed to make it, checked against the game as it exists today. The interactive planner lives in the Tailoring Companion.
How to get the sewing pattern
The sewing pattern is rank 6 and survives 30 uses; every crafting attempt spends one use.
Arc Lich: Hunt Arc Lich in Connous during the Metus fight for a chance at a tailoring manual. No special entry pass required beyond reaching the Metus encounter
Materials
Expect about 6 attempts per finished item (17% average progress per attempt). Per-attempt materials are consumed on every attempt; finishing materials once per item.
Each attempt uses
3× Fine Fabric — weaving on a loom, low rank
3× Fine Silk — weaving on a loom, low-mid rank
5× Braid — low-rank Weaving skill output
Finishing (once per item)
1× Fine Finishing Thread — Buy directly from any general goods NPC shop.