Men's casual blazer

A men's casual blazer strips out the structure of a business jacket without giving up the shape entirely, built to be worn open over a t-shirt as easily as a shirt.

Construction and fabric

Cut with an unstructured, unlined build, the jacket removes the internal canvas and shoulder padding found in tailored blazers, resulting in a softer line that moves closer to a jacket than a suit component. Cotton, linen-cotton and lighter wool blends dominate the range, chosen specifically for how they drape without the stiffness a structured jacket relies on.

Styling a men's casual blazer down from tailoring

Worn with the sleeves pushed up and no tie, a casual blazer reads considerably more relaxed than a structured suit jacket, a distinction Hackett London has built into a dedicated unstructured line since expanding beyond formal tailoring in its early collections. Pairing it with jeans or chinos rather than dress trousers reinforces the casual register further.

A navy unstructured blazer over a plain t-shirt and jeans for a relaxed weekend look.
The same blazer over a shirt for a smart-casual dinner.

What makes a blazer casual rather than formal?

An unstructured, unlined construction with a softer shoulder and no internal canvas is what separates a casual blazer from a formal, tailored jacket built with structured padding and lining.

Can a casual blazer be worn with a t-shirt?

Yes, an unstructured blazer works well over a plain t-shirt for smart-casual settings, particularly in a softer cotton or linen-cotton blend rather than a stiff worsted wool.

Is a casual blazer suitable for the office?

A casual blazer works for relaxed, business-casual offices, though a more structured wool blazer remains the safer choice for client-facing or formal business settings.