Denim Fabric Guide: Weights (oz), Rigid vs Stretch, Selvedge & Washes

Denim looks simple — it's just blue cotton twill — but it's one of the most variable fabrics in apparel. Weight, construction, stretch content, and finishing each dramatically change how a denim garment looks, feels, and wears in. This guide covers the denim specs that matter when you brief a manufacturer.

Denim Weight: Measured in Ounces

Unlike most fabrics (measured in GSM), denim is traditionally measured in ounces per square yard (oz). The weight defines the character of the garment.

Weight	Feel	Best for
8–10 oz	Light, soft, easy to wear	Summer jeans, shirts, dresses, lighter women's
11–13 oz	Mid-weight, the all-rounder	Everyday jeans, jackets
14–16 oz	Heavy, structured, durable	Premium raw denim, workwear
16–21 oz+	Ultra-heavy, rigid	Enthusiast raw denim, statement pieces

Heavier denim is more durable, holds shape better, and develops sharper fade lines over time — but it's stiffer to break in and hotter to wear. Most commercial jeans sit at 11–13 oz.

Rigid vs Stretch Denim

• Rigid (100% cotton) — traditional denim with no stretch. Authentic, develops character and fades beautifully, but less forgiving in fit. Preferred for raw/selvedge and heritage styles.
• Stretch denim — cotton blended with a small percentage of elastane (e.g. 98/2 or 2–4% spandex), sometimes with polyester. Comfortable, fitted, recovers shape. The standard for skinny and modern-fit jeans and most women's denim.
• Comfort/power stretch — higher elastane plus recovery fibers for maximum stretch and shape retention (jeggings, athletic-fit).

The stretch decision is driven by fit and audience: skinny and fitted styles need stretch; relaxed, wide-leg, and heritage styles work rigid.

Construction: Twill Direction & Selvedge

Twill direction — denim is a twill weave with diagonal lines:

• Right-hand twill (RHT) — diagonal runs lower-left to upper-right; smooth, soft hand. Most common.
• Left-hand twill (LHT) — opposite diagonal; softer after washing.
• Broken twill — zig-zag pattern that reduces leg-twisting.

Selvedge vs wide-loom:

• Selvedge denim — woven on traditional narrow shuttle looms, producing a clean, self-finished edge (the "self-edge"). Associated with premium, heritage, and raw denim. More expensive, lower output.
• Wide-loom denim — modern high-output looms; the vast majority of commercial denim. No selvedge edge but far more economical.

Color & Indigo

• Indigo dyeing — classic blue. Indigo bonds to the surface of the yarn, which is why denim fades at high-friction points as the white core shows through. Ring dyeing (indigo on the outside, white core) is what makes fades possible.
• Sulphur dyeing — used for blacks, greys, and overdyes; more uniform, less dramatic fading.
• Garment dyeing & overdye — color applied to the finished garment for tonal effects.

Washes & Finishing

The wash transforms raw denim into the final look. Briefly:

• Raw / rigid — unwashed, dark, stiff; fades to the wearer over time.
• Stone wash — tumbled with pumice for a worn, softened finish.
• Enzyme wash — enzymes soften and lighten without heavy stones.
• Acid wash — high-contrast bleached marbling.
• Bleach / light wash — lightened overall tone.
• Distressing — whiskering, hand sanding, grinding, laser fading for worn detailing.

For the full breakdown, see our garment wash & dye techniques guide.

Hardware & Construction Details

Denim is defined by its details: copper or antique rivets, shank buttons (often logo-stamped), bar tacks at stress points, chain-stitch hems (which produce the prized "roping" fade), contrast topstitch thread, and back-pocket arcuates. Specify these on your tech pack — they're a big part of perceived quality.

How to Spec Denim on Your Tech Pack

Fabric: 12.5 oz, 98/2 cotton/elastane stretch denim, right-hand twill, indigo ring-dyed. Wash: medium stone wash with light whiskering. Hardware: antique brass rivets + logo shank button. Hem: chain-stitch.

Capture all of it with our free tech pack template.

Make Your Denim With a Specialist

Denim demands a factory that understands wash chemistry and construction. Potato Apparel produces jeans, jackets, shorts, and skirts in 8–21 oz rigid and stretch denim, with a full in-network wash and distressing program and custom hardware.

• Custom Denim Manufacturer — full denim program, MOQ 50 pcs.
• Custom Streetwear Manufacturer — denim within a streetwear range.

Have a reference pair or a wash you want to match? Send it over and we'll develop a denim and wash sample for your approval.