Short answer
hopsack is a open weave cloth of about 280–330 g/m², at its best in three-season. A coarse, open plain weave for blazers — breathable, durable, and forgiving of casual handling.
At a glance
FamilyOpen weave
Weight280–330 g/m²
SeasonThree-season
Best forBlazers, sport jackets
Choosing hopsack at your fitting
Tell the tailor your cities and your calendar — hopsack earns its place when the answer matches three-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.