Direct Sewing • The stitch comparison guide
Same garment. Two different jobs.
An overlocker trims and wraps the fabric edge. A coverstitch machine makes the flexible, parallel-row hems you recognise on a T-shirt.
If you already own a sewing machine, choose an overlocker for garment seams and edge finishing. Choose a coverstitch when stretchy hems are the job you most want to improve.
Refreshed 20 September 2026 • Real manufacturer stitch photographs • NZ machine choices checked against our available stock
Look closely: seam edge or folded hem?
These are photographs of actual JUKI stitch samples. Each piece is turned back to reveal the reverse. Follow the thread and the fabric edge, rather than judging by the number of cones on the machine.
Four-thread overlock
Look for: loops wrapping right around the cut edge. Two needle threads and two looper threads form this stitch.
Use it for: joining many knit seams and enclosing the seam allowance in the same pass. The knife normally trims the edge as you sew.
Two-needle coverstitch
Look for: two straight needle rows on the face and a band of looper stitches on the turned-back reverse.
Use it for: a folded T-shirt or sleeve hem. This is a three-thread stitch: two needle threads plus one lower-looper thread. It does not trim the fabric.
Try the T-shirt test: turn a T-shirt inside out. Examine its side seam, then its bottom hem. The side seam often has a wrapped raw edge; the hem usually has parallel rows outside and looper coverage inside. Garments vary, so use both sides to identify the stitch.
Stitch photographs: JUKI’s MO-1000 samples and MCS-series samples. These illustrate stitch construction, not a promise that every machine makes every stitch shown.
Which machine solves your sewing problem?
Start with the job you want to do. A machine with more threads is not automatically the right machine for that job.
| What you want to make or improve | Choose | Why it fits |
|---|---|---|
| T-shirt side seams, sleeves and knit construction | Overlocker | A four-thread seam joins layers and encloses the raw edge. |
| Neater seam allowances inside woven garments | Overlocker | Finish raw edges; use your sewing machine for the construction seam where the pattern requires it. |
| Stretchy T-shirt, legging and sleeve hems | Coverstitch | Secure a folded hem with parallel needle rows and flexible looper coverage. |
| Narrow rolled edges on scarves and frills | Overlocker | A rolled-hem setting wraps a very narrow fabric edge. |
| Decorative thread coverage on the top of activewear | Top-cover capable coverstitch | Look specifically for top-cover capability, such as the Brother CV3550 or Janome CoverPro 3000. |
| Both garment assembly and repeated knit hemming | Separate machines, or a suitable combination model | Separate machines stay ready for each job. A combination machine saves space but requires a change of setup. |
| Zips, buttonholes, darts and general sewing | Regular sewing machine | Neither specialist machine replaces all the jobs of a sewing machine. |
Three more stitches worth recognising
Rolled hem
A tightly wrapped, narrow edge for lightweight finishing. It is structurally different from a folded coverstitch hem: there are no two parallel needle rows set back from the edge.
Triple coverstitch
Three needle rows on the face, with looper coverage underneath. Three needles plus one looper make four threads. The photograph shows standard triple coverstitch, without top-cover thread.
Chainstitch
One needle row on the face and a chain on the reverse. One needle thread plus one looper thread make this two-thread chainstitch. It does not wrap or trim a raw edge.
Top cover, twin needle and flatlock are different
Top coverstitch adds another thread across the top surface. The Brother CV3550 and Janome CoverPro 3000 can make it; the Juki MCS-1500 does not have this function.
A twin needle on a sewing machine can make two rows on the face, but its bobbin thread zigzags underneath. That is not a true looper-based coverstitch.
Overlocker flatlock uses a different setup and is pulled open after sewing. It is not the same stitch as coverstitch or a specialist industrial flatseam.
How the machines work together on a T-shirt
- 1. Construct the garment. Use a suitable four-thread overlock setup for the knit seams, following the pattern’s seam allowance and construction order.
- 2. Prepare the hem. Measure, fold and press it evenly. On a sample, position the needles so the looper coverage catches the raw edge underneath.
- 3. Coverstitch and check. Sew the hem without pulling the fabric. Inspect both sides and gently stretch the sample before sewing the garment.
A good sample matters more than a universal tension recipe. Start with the machine manual, the correct needle system and an offcut folded to the same thickness as your hem. Differential feed controls how the fabric feeds; tension, foot pressure, stitch length and handling also affect the finish.
If the result is wrong: for waves, check feeding and avoid stretching the fabric by hand; for a raised ridge between needle rows, check tension and hem support; for skipped stitches, check the needle and threading. Change one setting at a time, then test again. Secure thread ends using your model’s instructions.
Available machines to put on your shortlist
These six models were listed online with positive stock when checked on 20 September 2026. Prices are in NZ dollars. This is a selected shortlist; prices and stock can change, so check the product page before ordering.
For seams and edge finishing
Janome 8004D
NZ$499
A practical 3/4-thread overlocker with differential feed and rolled-hem capability for everyday garment sewing.
Know before buying: Conventional threading; no coverstitch function.
View Janome 8004D
Brother 2504D
NZ$579
A 3/4-thread option with colour-coded guides, F.A.S.T. lower-looper access and a free arm.
Know before buying: Easy-threading features do not mean air threading. This is an overlocker, not a coverstitch.
View Brother 2504D
Juki MO-1000
NZ$1,895
Powered air threading for the loopers, plus 2/3/4-thread overlocking. Worth comparing if threading is your main frustration.
Know before buying: Air threading changes setup convenience; it does not add coverstitch.
View Juki MO-1000For hems, chainstitch and cover stitching
Brother CV3550
NZ$999
Wide, narrow and triple coverstitch, chainstitch and top-cover stitches, with a free arm for tubular work.
Know before buying: Top-cover sewing needs its correct spreader setup. It does not overlock or cut fabric.
View Brother CV3550
Juki MCS-1500
NZ$1,475
Wide and narrow two-needle coverstitch, triple coverstitch and single-needle chainstitch for regular knit finishing.
Know before buying: No top-cover function and no overlocking knife.
View Juki MCS-1500
Janome CoverPro 3000
NZ$2,299
Built-in top-cover guide, needle threader, Fine Mode and free arm. Compare it if setup convenience and top-cover work matter to you.
Know before buying: A dedicated coverstitch machine; it does not replace an overlocker.
View Janome CoverPro 3000Buy one first, or buy both?
For most home garment sewists who already have a sewing machine, start with an overlocker. It improves a wide range of construction and finishing jobs. Add a coverstitch when you regularly sew stretch garments and want a more consistent hem.
If you already make reliable knit seams and mainly alter T-shirts or finish activewear hems, a coverstitch may solve your immediate problem first. A twin-needle hem on a compatible sewing machine remains a useful option while you decide.
Short of bench space? Ask about an overlocker/coverstitch combination machine. Check the exact stitch list and try the changeover process. Owning a five-thread overlocker alone does not guarantee coverstitch capability: a five-thread safety stitch can combine an overlock with a chainstitch.
Choose by the fabric you actually sew.
Bring a fabric sample and tell us what you want to make. Our team can help compare seam construction, hem appearance, threading and the attachments that suit your projects.
Visit Direct Sewing at 138 Railside Avenue, Henderson, Auckland, or contact us for advice before ordering online. Our onsite workshop also supports servicing and repairs.
Explore overlockersExplore coverstitch machinesAsk our teamYour overlocker and coverstitch questions
Can an overlocker sew a proper coverstitch hem?
A standard overlocker cannot. A combination machine can only do it if coverstitch is an explicitly listed function, and it must be set up in the correct mode.
Do I have to overlock a hem before coverstitching?
Usually not for a straightforward knit hem. When positioned correctly, the coverstitch looper covers the folded raw edge. Test the fabric and follow your pattern: overlocking first can add unnecessary bulk.
Is a coverseam machine the same as a coverstitch machine?
In domestic sewing these names commonly describe the same type of machine. Check the actual functions: standard coverstitch, top coverstitch and overlocking are different capabilities.
Does more thread always mean a stronger or better stitch?
No. Needle count, stitch formation, fabric, thread and setup all matter. A four-thread overlock and a four-thread triple coverstitch use the same total number of threads for different jobs.
Will either machine replace my normal sewing machine?
No. Keep your sewing machine for zips, buttonholes, darts, many woven seams and other detailed construction. These specialist machines work alongside it.
Image credits and specification checks: Stitch sample photographs © JUKI Corporation, from the MO-1000 and MCS-series manufacturer pages. Additional checks: Brother CV3550 brochure, Janome CoverPro 3000 specifications and Janome 8004D specifications. Machine photographs and NZ prices are from the linked Direct Sewing listings. Product photos identify the machines; stitch samples are separately labelled above.