Formal Marine Denim Jacket

A jacket that commands presence... sharp in its lines, timeless in its wear.

Carry confidence and effortless style in the Formal Marine Denim Jacket. Inspired by formal marine jackets and reimagined through denim, it balances structure and ease with an oversized yet tailored silhouette, a cinched waist, and strong shoulders. It is the kind of jacket that makes you stand a little taller, feel a little more confident, and instantly look pulled together.

Cotton blend denim with soft structure and slight stretch

Inspired by naval formalwear, refined through denim

Oversized tailored fit with cinched waist

Structured shoulders with subtle shoulder pads

$395.00 USD

Tax not included.

Shipping calculated at checkout.

Size	US Size	Bust (in)	Waist (in)	Hips (in)
XS	0-2	31-33	24-26	34-36
S	4-6	33-35	26-28	36-38
M	8-10	35-37	28-30	38-40
L	12-14	37-40	30-33	40-43
XL	16-18	40-43	33-36	43-46

Size	US Size	Chest (in)	Waist (in)	Hips (in)
XS	34	32-34	26-28	33-35
S	36	35-37	29-31	36-38
M	38-40	38-40	32-34	39-41
L	42-44	41-43	35-37	42-44
XL	46-48	44-47	38-41	45-47

Size

XS

S

M

L

Color: Dark Indigo

Quantity

In stock - Ready to be shipped

Estimated delivery between June 18 and June 22. Order within .

The Formal Marine Denim Jacket was designed to bring structure, confidence, and effortless style into everyday dressing. Inspired by vintage marine formalwear, it balances sharp tailoring with the ease and character of denim, becoming more personal with every wear.

The oversized yet tailored fit creates a distinctive silhouette, with a cinched waist adding shape and subtle shoulder pads bringing strength and presence. Elongated sleeves enhance the relaxed proportions, creating a balance of polish and ease that feels both modern and timeless.

Layered over the Aether Cashmere Top, the Coquette Embroidered Blouse, paired with denim, or worn casually over everyday essentials, the FMJ is the kind of piece that instantly pulls a look together while making you feel confident the moment you put it on.

80% Cotton
18% Polyester
2% Spandex

Crafted from a cotton-rich blend with subtle stretch, offering breathability, resilience, and ease of movement — making it as functional as it is stylish.

Dry clean only — recommended to maintain the jacket's shape and refined finish.

Every order leaves our studio with care, packed and shipped Monday through Friday (never on holidays, when we all slow down). Once you place your order, we’ll have it on its way within 2–5 business days.

If something isn’t quite right, we accept returns or exchanges on unworn pieces, tags still attached, within 30 days of purchase. Refunds can be made to your original payment method, or as a gift card if you’d prefer store credit.

A note on Final Sale pieces: those are treasures meant to stay with you, so they can’t be returned or exchanged.

Still unsure or need a hand? Write to us at hello@heirloomamalgam.com ... it’s Amy and Scott on the other side, and we’ll help.

Pay with