Flatlock Vs Coverstitch Stitch| How They Differ & My Favourite One

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Whenever there is talk about serger stitches there is a mention of flatlock stitch and cover stitch.  I used to confuse the two all the time. They both look neat, have stretch, and are great for knits. But they serve very different purposes once you get into the details.

But there are differences between flatlock vs coverstitch for intense,

Cover Stitch Vs Flatlock

Flatlock creates a decorative, open seam ideal for layering, while coverstitch forms a strong, stretchy hem perfect for finishing knit garments.

I’ll also show you real examples from my own sewing projects and let you in on which one I personally reach for more (and why!) like flatlock vs overlock.

flatlock vs coverstitch

Is Flatlock The Same As Coverstitch?

Nope, flatlock and coverstitch are not the same. Although they are often confused because they’re both used with stretch fabrics and sergers. But the reality is,

Is Flatlock The Same As Coverstitch

Flatlock joins two pieces of fabric edge-to-edge and lies completely flat. It creates a decorative seam you can wear inside-out or right-side-out. That’s why it’s one of the best stitches among serger stitches.

Coverstitch Finishes hems and seams while still allowing the fabric to stretch. You often see this on T-shirt hems 2 lines of straight stitches on top, loops underneath.

Different looks, different functions!

Flatlock Vs Coverstitch Key Difference

Flatlock stitch is mainly used for decorative seams that lie flat, while coverstitch is used for hemming stretchy garments with a clean, professional finish.

 But rather than that they also differ in,

Flatlock Vs Coverstitch Key Difference
Flatlock StitchCoverstitch
Decorative seams, joining panelsHems on knitwear, stretchy fabric hems
Looks like ladders or braided chainsTwin parallel lines (like ready-made tees)
Loops or ladder effectSerger-like loops
High stretch, ideal for activewearGood stretch, ideal for hems
Yes – joins fabric edges flatlyNo – mainly used for hemming
Wider and more visibleCleaner and narrower
Serger with flatlock settingsCoverstitch machine or combo serger
Medium (can unravel if not secured)Strong and durable
Yoga wear, decorative panels, sportswearT-shirt hems, leggings, swimwear hems

Which Is Stronger Among Flatlock Vs Coverstitch?

After experimenting with both stitches on a bunch of knit projects like leggings, t-shirts, and workout tops. I’ve noticed something,

Which Is Stronger Among Flatlock Vs Coverstitch

Coverstitch is hands down stronger than the flatlock stitch.

When I really put stress on the fabric, like pulling at a hem or stretching a neckline, the coverstitch held up better over time. It gives a cleaner, more secure finish that doesn’t unravel easily like overlock.

So while I love flatlock for design and flexibility, coverstitch is my favourite when I want durability with stretch.

When To Use A Flatlock Stitch?

Flatlock is ideal for seams that require exceptional comfort and stretch. It lies flat against your skin. So, it’s awesome for things like leggings, activewear, or baby clothes, where you don’t want any bulky seams poking you.

Plus, it looks neat on both sides, so if you flip your garment inside out, it still looks great. And if you want to add a little style with visible stitching, flatlock’s ladder-like look is a cool bonus.

Basically, if I am stitching with stretchy fabrics or want a seam that’s both functional and flattering, flatlock is the stitch I want.

When To Use A Flatlock Stitch

Frequently asked questions

Do I need a serger for flatlock and coverstitch?

You can do flatlock with a regular serger. But coverstitch usually requires a dedicated coverstitch machine or a combo machine that offers both.

Can flatlock be used decoratively?

Absolutely! I’ve used flatlock as a visible design element. Especially when done with a contrasting thread. It’s great for giving a garment that store-bought athleticwear look.

Which one’s easier to set up?

Flatlock can be fiddly at first—adjusting tension takes trial and error. Coverstitch is easier once you get the hang of threading and balancing tensions (especially the looper).

Final Thought

After testing flatlock vs coverstitch on various projects. I consistently find myself reaching for the coverstitch when I want a clean, strong, and ready-to-wear finish. Flatlock’s fun and decorative. But coverstitch just wins for everyday reliability. It’s become my go-to, hands down.

Maisha Soumee

Maisha Soumee

Hi there! I’m Maisha Soumee, the proud torchbearer of our family’s sewing legacy and the driving force behind this website. With Grandma Manha’s teachings as my foundation, I’m honored to continue the tradition of craftsmanship and creativity. As a passionate seamstress, I’m dedicated to sharing the joy of sewing with you, our valued community.

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