The Bonneville in Burnt Sienna: a 1.3 mm full-grain leather with a controlled evolution.

The Master Supply Co Bonneville sits in the tradition of half-belt leather jackets, a structured silhouette inherited from the American western and workwear wardrobe. The leather chosen is a full-grain cowhide of 1.3 mm - a substantial thickness that gives the jacket its structure and presence from the very first wear. In Burnt Sienna, the material rests on a warm brown base run through with subtle red undertones, which become more visible on high-stress areas and along the edges. A depth achieved without resorting to heavy contrast: the tone stays controlled, legible, never demonstrative.

An aniline finish and a moderate pull-up effect.

The aniline finish leaves the surface open enough for the full grain to remain visible - the difference between a leather that shows what it is and one masked by a pigment layer. Oils and waxes are worked into the hide to create a mild pull-up effect and natural tonal movement. As these waxes migrate through handling, compression and wear, lighter and darker areas appear across the surface, with the effect more pronounced in certain parts of the hide. This variation is not a dyeing fault: the colour is consistent within the leather, and the visible tonal shifts result solely from the movement and concentration of its oils and waxes. They will continue to shift and gradually blend as the jacket is worn. A light topcoat stabilises the finish - it improves colour fastness and limits transfer, which keeps the jacket wearable from day one while still allowing its character to develop over time.

A construction built for movement.

The back of the Bonneville is fitted with a bi-swing action system with expansion pleats, freeing up mobility through the shoulders. This construction is anchored by a fixed half-belt, side buckle adjusters that draw in the hem, a rear V-yoke and a defined kidney-panel seam - an arrangement that structures the silhouette without constraining it. The low-profile collar, with its centre-back seam and shortened points, sits cleanly whether worn up or down. The front closure is handled by a Talon 10 mm zipper with an arrowhead leather pull tab, positioned slightly above the hem to prevent stacking and distortion at the waistband. Added to this are two angled hand-warmer pockets with reinforced openings, a YKK zip chest pocket with chain pull, metal ventilation grommets under each arm, snap-adjustable cuffs and leather adjustment tabs with solid metal buckles. The interior is fully lined in sage green cotton twill - an understated contrast to the exterior - and features two pockets, one zipped, one open.

Master Supply Co designs its pieces in Toronto, crossing outlaw spirit with northern grit. The brand works with full-grain cowhide and buffalo hide, selected for their strength, character and ability to age naturally. Every jacket is individually photographed, measured and quality-checked before it ships - a level of rigour that explains both the production lead times and the consistency of what is delivered.

Features

Full-grain cowhide leather, 1.3 mm: a substantial thickness that gives the jacket its structure and presence.
Aniline finish with wax and oil infusion: preserves visible grain and creates natural tonal movement across the surface.
Stabilised topcoat: improved colour fastness with reduced transfer, allowing for controlled, gradual ageing.
Warm brown base with red undertones: depth visible at edges and wear points, without high-contrast break-through.
Half-belt silhouette: structured profile with balanced proportions and clean back detailing.
Bi-swing action back with expansion pleats: increased shoulder mobility.
Fixed half-belt with side buckle adjusters: integrated waist suppression and fit control.
Angled hand-warmer pockets: reinforced openings for durability.
YKK zip chest pocket: single chest pocket with chain pull.
Low-profile collar: centre-back seam with shortened points, for a clean sit worn up or down.
Sage green 100 % cotton twill lining: durable, breathable interior with understated contrast.
Two interior pockets: one zipped, one open-faced.
Talon 10 mm main zipper: heavy-duty front closure with leather pull tab and raised start to reduce waistband distortion.
Underarm ventilation eyelets: dual metal grommets per side for airflow.
Snap-adjustable cuffs: secure closure with branded hardware.

Frequently asked questions

How do I choose my size for the Bonneville?

Master Supply Co jackets run fairly true to size and sit close to the natural body. The method the brand recommends is to take your chest and bottom measurements, then add 8 to 12 cm - the result corresponds to the jacket measurement to choose. If you plan to layer a thick mid-layer underneath, the larger size can be considered.

What is the pull-up effect?

Pull-up describes the tonal variation that appears when a leather infused with waxes and oils is folded, stretched or compressed: the stressed areas lighten temporarily, revealing the paler base beneath. On the Bonneville this effect is deliberately mild - it creates visible but restrained tonal movement, without the dramatic contrast of more aggressive pull-up leathers.

Are the tonal variations in the leather a fault?

No. The colour is consistent within the leather. The lighter and darker areas visible on the surface result solely from the movement and concentration of the oils and waxes worked into the hide. These variations are inherent to this type of finish and will continue to shift and blend as the jacket is handled and worn.

What does the bi-swing back do?

The bi-swing system relies on expansion pleats set into the back, on either side of the shoulder blades. They free up the range of motion in the shoulders and arms - a construction detail drawn from American workwear, particularly useful when the jacket is worn close to the body. It allows a fitted cut without sacrificing mobility.

Why does the main zipper start above the hem?

The Talon 10 mm zipper begins slightly above the bottom hem to prevent material stacking and distortion at the waistband - a common issue on half-belt jackets whose closure runs all the way down. This positioning guarantees a clean line at the waist, whatever the position of the body.

How do I care for this aniline-finished leather?

Aniline leather calls for measured care. A wipe with a dry or slightly damp cloth is enough for surface marks. A nourishing product suited to aniline leathers, applied once or twice a year, maintains suppleness without saturating the surface - test it on a discreet area first, as these leathers react more strongly to products than pigmented ones. Avoid prolonged exposure to rain and direct sunlight.

Is there any risk of the leather transferring onto clothing?

A light topcoat is applied to the leather precisely to limit this: it improves colour fastness and noticeably reduces transfer, which keeps the jacket wearable from day one. As with any aniline leather, it remains advisable to avoid prolonged contact with light-coloured textiles during the first few wears, particularly in damp weather.

Men's Jacket Master BONNEVILLE BURNT SIENNA