Short answer
Serge is a worsted twill cloth of about 270–310 g/m², at its best in four-season. The classic tight diagonal — serviceable, dignified, nearly immortal.
At a glance
Choosing Serge at your fitting
Tell the tailor your cities and your calendar — Serge earns its place when the answer matches four-season wear. The shortlist you receive will pair it with one or two alternatives, and the choice is always yours.
Cloth notes are guidance, not inventory: availability varies by season. What is reserved for you is confirmed in your written quotation.