Ceann Bliana Scholar's Ringbands 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 Dan 3 and survives 30 uses; every crafting attempt spends one use.
Glenn Bearna: Clear Glenn Bearna near Sliab Mis and take the Ceann Bliana pattern rewards.. Requires Total Arcana Level 50+, one Arcana at Link 1+, and Dark Dreams of a Winter Wind cleared.
Materials
Expect about 8 attempts per finished item (13% average progress per attempt). Per-attempt materials are consumed on every attempt; finishing materials once per item.
Each attempt uses
1× Crystallized Remnants of Winter — trade 35 Frostwork Crystal Shards to Suspicious Merchant (shards from Glenn Bearna raid)