TutorialPost 3048 min read
How to Design Denim Jeans: Washes, Fits, and Details
How to design denim jeans — covering denim fabrics, wash treatments, fit specifications, hardware details, and creating production-ready tech packs.
Denim fabric selection
Denim is a twill-woven fabric, typically cotton or cotton blend. Key specifications:
- Weight: Light (8-10 oz), medium (11-13 oz), heavy (14-16+ oz)
- Weave: Right-hand twill (most common), left-hand twill (softer), broken twill (less torque)
- Stretch: Rigid (no stretch), comfort stretch (1-3% elastane), super stretch (5%+ elastane)
- Selvedge: Woven on shuttle looms with self-finished edge — premium denim
- Origin: Japanese denim, Turkish denim, Italian denim, American denim — each has distinct character
Wash and finish treatments
Denim wash is a defining design element:
Common denim washes
| Wash | Description | Effect |
|---|---|---|
| Raw/unwashed | No wash treatment applied | Dark, stiff, develops personal fading over time |
| One wash | Single rinse wash | Slight softening, removes shrinkage |
| Stone wash | Washed with pumice stones | Moderate fading, soft hand |
| Enzyme wash | Chemical treatment for softness | Clean fading without stone damage |
| Acid wash | Chemical bleaching for high contrast | Dramatic, uneven bleaching pattern |
| Vintage wash | Multiple treatments for aged effect | Worn, lived-in appearance |
Hardware and details
Denim hardware is both functional and decorative:
- Rivets: Copper, antique brass, or nickel — placed at stress points
- Buttons: Shank button at waistband, typically branded
- Zipper: YKK brass or nickel, typically #4 or #5 weight
- Pocket arcuate: Decorative stitching on back pockets — a brand signature
- Leather patch: Back waistband patch with brand logo
- Bartacking: Reinforcement stitching at pocket corners and stress points
Creating a denim tech pack
Denim tech packs must include wash recipe specifications (or reference to the laundry's standard treatments), hardware finish and supplier details, pocket bag dimensions and fabric, and specific topstitch thread colors (typically gold or contrasting for denim). Specify whether the garment should be washed before or after construction for the finished measurements on your spec sheet.