ONI Denim Men's 18oz Olive Denim Jeans - Heavyweight, Regular Straight Fit, Button Fly, Made in Japan (ONI270-OLD18)

ONI Denim Men's 18oz Olive Denim Jeans - Heavyweight, Regular Straight Fit, Button Fly, Made in Japan (ONI270-OLD18)

ONI Denim

These men's olive denim jeans are made in Japan by ONI Denim, a brand known for its distinctive craftsmanship. Built on a classic five-pocket layout, they are cut in a modern silhouette and made from ONI's original textured denim, woven using the brand's specialized fabric-making approach. The result is a pair of jeans that delivers a vintage-inspired look and feel while fitting naturally into today's casual style. This balance of richly textured olive denim, traditional construction, and an updated fit sets the tone for a pair that feels rooted in heritage, yet designed for contemporary style and everyday wearability. This model uses ONI's heavyweight 18 oz olive denim, woven from 100% non-stretch cotton in a right-hand twill construction. The warp yarns are dyed olive, while the weft yarns are left undyed, and the fabric is woven on traditional shuttle looms. The result is a rugged, dry-hand denim with a coarse, bumpy texture, pronounced vertical streaking created by the undyed weft yarns subtly showing through the surface, and a naturally mottled, speckled appearance. Subtle yarn unevenness and fine speckling are part of the fabric's character, created by intentionally irregular cotton yarns for a more vintage, textured look. The jeans also feature authentic leg twist along both seams, and come in a one-wash finish to minimize shrinkage and give the denim a softer, more pliable feel from the start. They are finished with a leather waistband patch. These jeans are detailed with a button fly using antiqued metal buttons engraved with the brand logo, five belt loops, a leather patch on the right side of the back waistband, decorative stitching on both back pockets, and a classic five-pocket design reinforced with rivets for added durability. These jeans feature a regular fit with a straight leg, a mid-rise waist, and a traditional button fly. The seat and thighs offer a comfortable, regular fit that results in a well-balanced, timeless silhouette that is neither too slim nor too loose. This model is a new original design from ONI Denim, combining classic styling with the brand's signature denim fabric and exceptional craftsmanship.

Gender: Men.

Our model is wearing a tagged size 29. He stands 5'9" (175 cm) tall, weighs 127 lbs (58 kg), and has a chest measurement of 36 inches (91 cm). His usual size in U.S. denim is W29.

Fit: These jeans feature a regular fit with a straight leg, a mid-rise waist, and a traditional button fly. The seat and thighs offer a comfortable, regular fit that results in a well-balanced, timeless silhouette that is neither too slim nor too loose. Pre washed, minimal shrinkage. To ensure a comfortable fit, please refer to the actual garment measurements listed below. All measurements are taken with the garment laid flat and are provided in both centimeters and inches. Please note that slight variations may occur due to manual measurement. Fit may also vary depending on the design of each style as well as individual preference. For best results, we recommend comparing these measurements with a similar garment you already own.

Available Sizes.

The following measurements show the garment itself, not your own body.
Please compare them with a similar piece from your wardrobe to get a better sense of fit.

･Size 29 (Waist: 29")
･Size 30 (Waist: 30")
･Size 31 (Waist: 31")
･Size 32 (Waist: 32")
･Size 33 (Waist: 33")
･Size 34 (Waist: 34")
･Size 36 (Waist: 35.5")
･Size 38 (Waist: 37.5")

In inches

In centimeters

Lay the jeans flat, face up, without stretching or pulling the fabric.

Waist: Measure straight across the back waistband from one side to the other at the natural dip, then double that number to get the full waist size.

Inseam: Measure from the crotch seam down to the bottom of the leg along the inside seam.

Front Rise: Measure straight from the crotch seam (where the inseams meet) up to the top edge of the front waistband.

Thigh: Measure the width of the leg about 3 cm (approximately 1.2") below the crotch seam, straight across from one side to the other.

Leg Opening: Measure straight across the bottom hem of one leg, from one side to the other. This measurement represents the leg opening width.

Made in Japan.
Brand new with tags, in unused condition.
*All measurements are taken with the garment laid flat.
*Please note that slight variations in measurements may occur.
*Actual color may differ slightly from the photos due to lighting and screen settings.

Fabric Type: This model uses ONI's heavyweight 18 oz olive denim, woven from 100% non-stretch cotton in a right-hand twill construction. The warp yarns are dyed olive, while the weft yarns are left undyed, and the fabric is woven on traditional shuttle looms. The result is a rugged, dry-hand denim with a coarse, bumpy texture, pronounced vertical streaking created by the undyed weft yarns subtly showing through the surface, and a naturally mottled, speckled appearance. Subtle yarn unevenness and fine speckling are part of the fabric's character, created by intentionally irregular cotton yarns for a more vintage, textured look. The jeans also feature authentic leg twist along both seams, and come in a one-wash finish to minimize shrinkage and give the denim a softer, more pliable feel from the start. They are finished with a leather waistband patch. Through repeated wear and washing, the denim gradually evolves, developing fading patterns that uniquely reflect each wearer's lifestyle over time.

Number of Pockets: 5.

Pockets:
Front Pockets: Two front hand pockets reinforced with embossed metal rivets at stress points for enhanced durability.
Coin Pocket: One watch pocket (coin pocket) set into the right-hand pocket, also reinforced with embossed rivets.
Rear Pockets: Two rear patch pockets with open-top construction and internal concealed rivets to preserve a clean exterior silhouette while providing reinforcement from within.
Decorative Details: Decorative stitching on both back pockets.

Button Type: Five-button fly, including the top button, with antiqued metal buttons featuring the ONI Denim logo engraving.

Other details: These jeans also feature five belt loops, a leather patch positioned on the right side of the back waistband, and a classic five-pocket design reinforced with rivets.

Model name : 270 (ONI270-OLD18 ONI-270-old18) ONI Denim regular fit straight leg jeans / Heavyweight 18 oz olive denim regular straight jeans / Men's casual denim pants with button fly and regular straight fit / Mens japanese olive-colored denim jeans (olive jean pants).

Care Instructions

Machine wash at a maximum temperature of 40°C (104°F) on a normal cycle with the garment turned inside out.
･Do not use chlorine or oxygen bleach.
･Do not tumble dry.
･Hang to dry in the shade.
･Iron at a maximum sole-plate temperature of 150°C (302°F) using a pressing cloth.
･Do not dry clean.


Handling Warp-Dyed (Non-Indigo) Denim Products

･This product is made from denim with warp yarns dyed using non-indigo dyeing methods, while the weft yarns remain undyed. This dyeing approach creates depth of color and a distinctive surface appearance. Due to the characteristics of warp-dyed fabrics, slight color variation or unevenness may be present. We kindly ask for your understanding and recommend careful handling.

･Be cautious of color transfer caused by friction
Because the dyed warp yarns are exposed on the fabric surface, color transfer may occur through friction during wear. Please take extra care when wearing with light-colored or white garments, as well as when in contact with bags, furniture, or other surfaces.

･Washing instructions
Some color transfer may occur during washing, particularly in the early stages of use. We recommend washing this item separately. To help preserve the color and surface texture, turn the garment inside out before washing, avoid vigorous agitation or scrubbing, and allow it to air dry naturally.

･Be mindful of moisture and perspiration
Exposure to moisture such as sweat or rain may increase the risk of color transfer or color change. If the fabric becomes damp, allow it to dry naturally in a well-ventilated area away from direct heat or sunlight.

･Avoid discoloration caused by sunlight
Prolonged exposure to direct sunlight may cause discoloration or uneven fading. When drying, turn the garment inside out and avoid extended sun exposure.

･Please handle with care and enjoy the unique texture, depth of color, and individual character that naturally develop in warp-dyed denim over time.