Many UK clothing startups think CMT (Cut, Make, Trim) denim production simply means “finding a factory” — but that’s not the case. Without a clear CMT strategy, founders often accept poor fit, inconsistent washes, high waste rates, and delayed delivery, which damages brand credibility and profits. This guide breaks down how CMT denim production really works for UK startups, from sourcing skilled contractors and specifying trims, to quality checks, cost control, and production planning. Understand what questions to ask, how to avoid common pitfalls, and how to build a denim supply approach that supports scalable growth.