Men's formal blazer

The men's formal blazer from Hackett London is built for contexts that leave no room for compromise: first-rate fabrics, sartorial canvas construction and a silhouette that communicates authority quietly and without effort.

What defines a formal blazer

A men's formal blazer distinguishes itself from casual or business casual models through a series of precise construction decisions. Hackett London, with direct roots in the Savile Row tradition and a continuous presence in British menswear since its founding in 1983, builds its formal models with a floating canvas chest piece: an internal structure that is not bonded to the outer fabric, but free to move with it — allowing the cloth to drape naturally and adapt to the wearer's body over time. The result is a blazer that holds its shape without stiffness and improves with each wearing. Shoulders are built with a natural horsehair pad that maintains the shoulder line without the rigid effect of industrial construction, and internal seams are finished with surgete stitching throughout.

Fabrics in the Hackett London men's formal blazer range are sourced from established British and Continental weavers: combed worsted at 260–320 g/m² for four-season models, tropical wool at 200–240 g/m² for warmer months, and brushed flannel for winter cuts. Pure wool composition — without polyester or viscosa in the outer shell — is the standard Hackett maintains across its formal range.

Fabrics and finishes

The quality of a men's formal blazer is read in the internal finishes as much as the external cloth. Hackett London lines its sartorial models in Como silk or high-density viscosa, with clean-finish internal pockets and natural horn buttons on working cuffs — a detail that in tailoring is called surgeon's cuffs and that distinguishes properly finished construction from industrial approximation. Notch lapels in the classic models and peak lapels in the double-breasted cuts are finished with hand pick stitching: the row of visible stitching along the lapel edge that is the most immediate sign of a genuinely sartorial process.

The colour palette for the Hackett London men's formal blazer concentrates on what the formal context requires: navy in several fabric weights, charcoal and mid-grey, black for evening occasions and a selective number of patterns — thin chalk stripes, restrained Prince of Wales checks — that maintain the formality of the piece without surrendering character.

How to wear a formal blazer

The Hackett London men's formal blazer works best when the rest of the look is built with the same internal consistency. Two concrete combinations:

Formal navy wool blazer with a white classic-collar shirt, a silk tie in a thin stripe, grey flannel trousers and black leather oxford shoes: the business formal code that holds across any professional meeting, anywhere.
The same blazer over a pale blue shirt without a tie, mid-grey worsted trousers and tan leather derbies: the register drops one degree, the sartorial construction stays and the look works for a business lunch or a professional dinner.

The slim fit in Hackett London formal models is calibrated to hold the correct proportion between shoulder width and waist suppression — not the narrow fit of casual models, but a precise and contained version that flatters the silhouette without restricting movement across a long working day.

How to find your size

The Hackett London men's formal blazer in pure wool requires a precise size choice. The floating canvas chest piece gives the cloth a drape that bonded models cannot produce, but it does not correct a shoulder that is too wide or a chest that pulls. The shoulder is the critical point: it should close exactly at the edge of the anatomical shoulder, neither dropping onto the upper arm nor pulling toward the neck. Those between two sizes should try both before deciding.

What is the difference between a formal blazer and a suit jacket?

A formal blazer is a separates piece, designed to be worn with trousers in a different colour or fabric. A suit jacket is cut from the same cloth as its matching trousers and is constructed as a coordinated set. Hackett London formal blazers are always separates; the brand offers suits as a distinct category. The construction difference is minimal, but the wearing logic is entirely different.

Can a formal blazer be worn without a tie?

Yes, in most contemporary professional contexts. A Hackett London formal blazer in navy or grey over a plain or fine-stripe shirt with an open classic collar is accepted across most smart business environments without a tie. Button-down collars are less suited to a formal blazer: the collar's casual character creates a disconnect with the sartorial construction of the jacket. For the most formal settings — law, finance, institutional representation — a tie remains the correct choice.

How do you store a formal blazer between seasons?

Hackett London formal wool blazers should be stored in a cloth garment bag — not a sealed plastic one, which traps moisture — on a wide wooden or rigid-plastic hanger that maintains the shoulder shape. Before putting them away for the season, a professional dry clean removes any sweat residue or surface marks that, left to oxidise over months, can damage the fibre permanently. Away from direct light and in a breathable cover, a quality wool blazer will hold its character for decades.