Different Types of Stitches and Their Uses in Garments

The apparel industry often judges the quality of a garment by its smallest unit: the stitch. Whether you are joining two plies of fabric or finishing an edge, selecting the wrong stitch class can lead to seam failure or poor garment elasticity.

This guide breaks down the six essential stitch classes as defined by international standards, offering technical perspectives on their formation and best use cases.

The Mechanics of Stitching

Before diving into classes, it’s vital to understand how a stitch is actually formed. Every professional seam is created through one of three methods:

• Intralooping: A single thread passing through its own loop.

• Interlooping: a loop from one thread passes through a loop from another thread.

• Interlacing: One thread passing over or around another thread (common in lockstitches).

Intralooping

1. Class 100: Single-Thread Chain Stitch

Characterized by intralooping, Class 100 is produced with a single needle thread.

• The Pro View: While cost-effective, these stitches are highly insecure. If one thread breaks, the entire seam can unravel.

• Best Use Case: Temporary basting (positioning collars/cuffs) or for attaching buttons where a slight "give" is required.

2. Class 200: Hand Stitching (Simulated)

This class originates from traditional hand sewing. In modern manufacturing, specialized machines use a unique needle design to mimic this look.

• The Pro View: The process is a high-cost, high-skill operation.

• Best Use Case: Primarily found on luxury jackets and high-end tailored garments to give an "artisanal" finish to edges.

3. Class 300: Lock Stitch

The most common stitch in the world. It uses two groups of threads: a needle thread and a bobbin thread, joined by interlacing.

• Expert Tip: This stitch appears identical on both sides and offers exceptional security. However, it's important to monitor your bobbin closely, as running out of thread mid-seam is a frequent production bottleneck.

• Best Use Case: Joining standard woven fabrics, attaching pockets, and topstitching.

4. Class 400: Multi-Thread Chain Stitch

Also known as the "Double Lock Stitch," this uses a needle thread and a looper thread to create a chain effect on the underside.

• Expert Tip: It offers better elasticity than Class 300.

• Best Use Case: Heavy-duty items like jeans and trousers, where seam strength and a bit of stretch are mandatory.

5. Class 500: Over-Edge (Serging)

These stitches pass around the edge of the fabric, preventing fraying while providing high extensibility.

• The Pro View: Most machines in this class include a trimming knife to neat the edge before the stitch is applied.

• Best Use Case: Knitted fabrics and activewear where the seam needs to stretch without popping.

6. Class 600: Covering Chain Stitch (Flatlock)

The most complex class often uses up to nine threads, including needle, top cover, and bottom cover threads.

• The Pro View: It creates a "flat" seam that is comfortable against the skin.

• Best Use Case: Underwear and athletic base layers where bulky seams would cause irritation.

Quick Reference: Stitch Selection Table

Class	Type	Security	Elasticity	Primary Industry Use
100	Chain	Low	Low	Basting & Buttoning
200	Hand	Medium	Low	Luxury Finish
300	Lock	High	Low	Woven Garments
400	Multi-Chain	High	Medium	Denim & Workwear
500	Over-Edge	Medium	High	Knits & Finishing
600	Covering	High	Very High	Underwear & Gymwear

Conclusion

Choosing between a Class 300 lockstitch and a Class 500 overedge depends entirely on your fabric type and the expected wear of the garment. For beginners, mastering the lockstitch is the first step, but scaling up to professional production requires intimate knowledge of the elastic properties of chains and covering stitches.