AI Tech Pack Construction Details: Seams, Stitches, and Assembly Specifications
How AI tech packs specify construction details — seam types, stitch specifications, assembly sequence, and finishing instructions for garment manufacturers.
Construction details are the heart of a tech pack
Construction details tell the factory how to assemble the garment. Without clear construction specifications, a factory will use their default methods — which may not match your quality standards or design intent. An AI tech pack with proper construction callouts eliminates this guesswork.
Skema3D generates construction specifications based on your garment type, fabric choice, and quality level. The AI knows that a premium hoodie needs different seam treatments than a basic hoodie, and that knit garments use different stitch types than woven garments.
Seam types in AI tech packs
Different seam types serve different purposes and appear in different areas of a garment.
Common seam types and their applications
| Seam Type | Construction | Best For | Quality Level |
|---|---|---|---|
| Superimposed (SSa) | Two layers, edges aligned, single row | Side seams, shoulder seams | Standard |
| Lapped (LSc) | One edge overlaps the other, topstitched | Yoke seams, decorative joins | Standard-premium |
| French seam | Enclosed seam, no raw edges visible | Lightweight fabrics, premium interiors | Premium |
| Flat-felled | Folded, enclosed, double-stitched | Denim, workwear, activewear | Durable |
| Bound seam | Raw edges enclosed in binding | Unlined jackets, luxury interiors | Premium |
| Flatlock | Butted edges with flatlock stitch | Activewear, intimate apparel | Performance |
Stitch specifications
Each seam needs a stitch type specification. Your AI tech pack should specify the stitch class (ISO 4915 designation), stitches per inch (SPI), and thread tension.
- 301 (lockstitch): standard sewing stitch, 10-12 SPI for woven, 8-10 SPI for knit
- 401 (chainstitch): single-thread chain, used for hemming and seaming
- 406 (coverstitch): 2-needle bottom cover, used for knit hems and sleeve hems
- 504 (3-thread overlock): edge finishing, 12-14 SPI
- 516 (5-thread safety stitch): seaming and overlocking in one pass, 10-12 SPI
- 607 (flatlock coverstitch): flat seaming for activewear and intimate apparel
Assembly sequence notes
For complex garments, the tech pack should indicate the assembly sequence — the order in which garment components are joined. Skema3D's AI tech pack includes assembly notes for garments where the construction order matters: pocket attachment before side seam closure, collar attachment sequence, lining insertion timing.
These notes prevent construction errors that happen when a factory assembles components in the wrong order — for example, attaching a pocket after closing a side seam that prevents proper pocket alignment.
Quality-level construction presets
When prompting Skema3D, indicate your quality level: 'basic construction,' 'standard quality,' or 'premium construction.' The AI tech pack adjusts seam types, stitch specifications, and finishing details to match your quality tier.
Premium construction might specify French seams, self-fabric binding on interior seams, and single-needle topstitching — while basic construction uses standard overlock seams and double-needle hemming. Generate your construction-detailed tech pack at /ai-tech-pack-generator.