Huckberry - Flint and Tinder, Donegal Architect Shirt Color: Charcoal. Size: XL. The Architect Shirt is Flint and Tinder’s nod to workwear shirts, but brings a fresh level of refinement and attention to detail to the classic silhouette. This work shirt is cut from a Donegal fabric woven with small neps in the yarns—basically, little knots of fiber that add depth and texture to the fabric—that gives it a rugged look from afar but gives you a super soft feel up close. The approachable design is reminiscent of a classic Oxford, but FNT added reinforced elbow patches, a split back yoke, and a side vent gusset that’s commonplace in hardwearing workwear pieces.