From the workshop to the wardrobe
THE
SLACK
JACKET
There are garments whose importance lies not in their novelty, but in the fact that they quietly change the way we dress.
The Slack Jacket belongs to this category.
At first glance, it resembles a jacket. Its vocabulary is familiar: a lapel, buttons, sleeves and pockets. Yet to consider it simply as another interpretation of the blazer would be to miss the point. The Slack Jacket emerged from a different proposition, one in which tailoring is stripped of much of its ceremony and reconstructed around movement, comfort and everyday life.
It is a jacket for men and women, designed from the outset outside the traditional boundaries of formality. Rather than taking a formal jacket and making it casual through styling, the Slack begins with casualness as a principle of construction.
Its shoulder is natural, its body unstructured and its construction deliberately light. The silhouette remains relaxed, allowing the fabric and the wearer to determine much of its final shape. Its three-button front, softly rolling lapel and practical patch pockets place it within a vocabulary that owes much to American sports jackets and Ivy clothing, while its unlined and deconstructed character takes it considerably further from conventional tailoring.
This particular interpretation of the jacket has been explored by a number of influential names. Brooks Brothers and J. Press helped establish the language of natural-shouldered American tailoring, while John Simons became one of its most distinctive British advocates. Alan Flusser later developed his own interpretation of the Slack as a versatile, go-anywhere jacket. In France, J.Keydge gave the form another identity, bringing together elements of workwear, military and an increasingly relaxed approach to dressing.
What connects these interpretations is less a precise set of details than a common attitude towards clothing: the belief that a jacket can retain elegance without relying on stiffness or ceremony.
This is where the Slack becomes more than a softer version of a blazer.
Its apparent simplicity is deceptive. Removing structure from a jacket does not necessarily make its construction easier. On the contrary, once padding, lining and rigid internal components are reduced or eliminated, the precision of the cut, the balance of the pattern, the behaviour of the fabric and the quality of assembly become much more apparent. There are fewer internal constructions to compensate for an imperfect pattern, and therefore less room for error.
A traditional tailored jacket can rely on its architecture to create its shape. The Slack must achieve its character through proportion, fabric and movement.
This also explains why its production calls upon techniques that are often treated separately. Pattern cutting, soft tailoring, garment construction and post-assembly finishing all become part of the same process. The apparently simple result therefore depends on a very specific form of technical knowledge.
And this is where the history of denim offers an illuminating parallel.
Denim-adjacent
The history of denim is perhaps one of the clearest examples of utility becoming culture.
The blue jean began as a practical garment designed for work. Levi Strauss and Jacob Davis developed riveted trousers in the nineteenth century to withstand demanding physical labour. Over time, however, their function became only one part of their identity. Jeans moved from mines, ranches and workshops into youth culture, music, cinema and eventually almost every wardrobe in the world.
The remarkable thing is that denim did not become culturally important by abandoning its origins. Its appeal came precisely from the fact that those origins remained visible in the construction, the fabric and eventually in the way the garment aged.
The Slack Jacket follows a similar trajectory.
Its utilitarian ancestry remains present in its relaxed construction, practical pockets, natural shoulder and uncomplicated silhouette, but these elements are no longer dictated by a specific profession or uniform. They have become a language of dress.
The transformation becomes even more apparent through finishing.
Garment dyeing, garment washing, stone washing, used effects and other post-assembly treatments allow the same fundamental garment to acquire radically different personalities. They soften the construction, alter the depth and irregularity of colour and give the surface an appearance that suggests a history of wear before the jacket has even reached its owner.
But unlike a conventional tailored jacket, the story does not necessarily end with the finishing process. For non-wool versions, the Slack can also be machine washed, bringing it closer to the everyday practicality of a pair of jeans than to a traditional tailored jacket that requires dry cleaning. Washing becomes part of the garment's life rather than something to be avoided. With repeated wear and washing, the fabric can soften further, the colour can evolve and the jacket can gradually acquire the particular character of its owner.
This is particularly interesting in the context of denim. Washing was initially something that happened to jeans through use; it eventually became something deliberately reproduced by manufacturers. Fading, abrasion and softness, once evidence of a garment's history, became desirable characteristics in their own right.
The Slack Jacket can be treated in much the same way. Garment dyeing and washing create an unusually broad field of colour and surface possibilities. More importantly, these treatments reinforce the fundamental philosophy of the garment: it should look increasingly natural rather than increasingly formal.
The jacket therefore has the potential to exist in an almost infinite range of interpretations without losing its identity. The same pattern can move from crisp cotton to washed linen, corduroy, herringbone or other natural fabrics, while different dyes and finishing processes give each version a distinct character.
The end of the dress code
The cultural significance of the slack jacket is inseparable from the broader casualisation of menswear.
During the twentieth century, the boundaries between work, leisure and formal dress gradually became less rigid. Sportswear entered everyday wardrobes; denim moved from the factory to the street; sneakers became acceptable far beyond the sporting field; and tailoring itself began to absorb the vocabulary of casual clothing.
The Slack Jacket sits precisely at this intersection.
It retains enough of the visual authority of tailoring to give an outfit structure, while its construction refuses the rigidity traditionally associated with a formal jacket. It can be worn with denim, chinos, fatigue trousers or tailored trousers, over a T-shirt, an Oxford shirt or knitwear. It can be worn open or buttoned, layered or worn alone.
Its versatility is therefore not simply a matter of styling. It is built into the garment itself.
This is what makes the Slack particularly relevant today. The contemporary wardrobe increasingly operates without a strict dress code, and garments that can move between contexts have become more valuable than those designed for a single occasion.
The Slack Jacket does not require the wearer to become more formal in order to accommodate it. Instead, it introduces a certain amount of structure into an otherwise relaxed wardrobe while preserving the ease of the clothes around it.
This quality also explains why the jacket translates so naturally across genders. Its essential characteristics — proportion, softness, movement and functionality — are not dependent on a particular masculine or feminine dress code. The garment can be interpreted through the wearer rather than prescribing a fixed identity.
A lived in garment
Our Slack Jacket begins with this history, but it is not intended as a reproduction of any single predecessor.
The references are multiple: American Ivy tailoring, French workwear, military apparel, the relaxed sports jacket, the evolution of denim and the broader movement towards casualisation. Each contributed something to the final proposition, but none defines it entirely.
The objective was to preserve the qualities that made this category of jacket so compelling — the natural shoulder, the absence of unnecessary structure, the relaxed proportions and the practical attitude — while developing them into a garment that feels appropriate to the present.
The result is deliberately uncomplicated, but not simplistic. Every component has a role in determining how the jacket behaves on the body: the cut establishes its balance, the construction allows it to move, the fabric determines its hand and drape, the pockets contribute both function and proportion, and the finishing gives the surface its individual character.
This is also why the jacket is intended to change with time. Its value is not dependent on remaining pristine. The fabric is chosen to respond to wear, the finishing is intended to soften its appearance and, in the non-wool versions, the ability to machine wash the garment means that care itself becomes part of the aging process.
In this sense, the Slack shares something fundamental with denim. Both began with utility, both escaped the confines of their original purpose, and both became cultural objects precisely because they could acquire a personal history.
The Slack Jacket is therefore less about dressing up than about changing what a jacket can be.
It takes the authority of tailoring and removes much of its formality; it borrows the durability and honesty of workwear without becoming a uniform; and it adopts the ease of sportswear without sacrificing proportion or refinement.
It is a jacket for the way we live now: less divided between work and leisure, less concerned with prescribed occasions and increasingly interested in clothes that can accompany rather than dictate the rhythm of everyday life.
That may ultimately be the Slack Jacket's most enduring quality. Like a well-worn pair of jeans, it is not meant to remain untouched. Its character emerges through use, its surface records time, and its relationship with the wearer becomes more individual with every season.
What begins as a simple jacket gradually becomes something more personal: a familiar piece of clothing, shaped by the person who wears it.
And perhaps that is the real evolution of the jacket — not from formal to casual, but from something we dress in to something we live in.