Cores' Healer Gloves is crafted with Tailoring in Mabinogi (gloves). 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 C and survives 30 uses; every crafting attempt spends one use.
Nora: Buy it from Nora at the inn in Tir Chonaill. (4,600 gold). No special requirement, just enough gold.
Galvin: Buy a pattern from Galvin's shop under the Observatory in Emain Macha. (4,600 gold). None beyond having enough gold.
Granites: Buy a pattern from Granites's general store in southwest Filia. (4,600 gold). Elf-allied humans get a discount, other races pay full price.
Pierrick: Buy it from Pierrick at the general store in Taillteann. (4,600 gold). Prices drop five percent on Wednesdays from the weekly shop discount.
Ilsa: Buy a pattern from Ilsa's general store in Tara. (4,600 gold). None beyond having enough gold.
Materials
Expect about 2 attempts per finished item (50% average progress per attempt). Per-attempt materials are consumed on every attempt; finishing materials once per item.
Each attempt uses
1× Common Fabric — buy from NPC shops
1× Common Silk — buy from Seal Merchant (Mondays) for seals, or weave rank F
1× Braid — low-rank Weaving skill output
Finishing (once per item)
1× Fine Finishing Thread — Buy directly from any general goods NPC shop.