How to Select Sewing Thread

Ever had a beautifully sewn garment fall apart after just a few wears? More often than not, the culprit isn’t the stitch or the seam—it’s the thread. Choosing the right sewing thread isn’t just about color; it’s about matching fiber, strength, and function to your fabric and project. Get it wrong, and your seams pucker, break, or leave visible holes. Get it right, and your work holds up beautifully, wash after wash.

At Pura Fabric, we’ve seen countless sewists—both beginners and seasoned—struggle with thread-related issues. Many assume all-purpose thread is truly “all-purpose,” only to discover it melts under an iron or snaps when sewing stretchy knits. The truth is, thread selection is a silent partner in your sewing success.

Thread Types

All Purpose

Polyester or cotton-wrapped polyester threads are the workhorses of most sewing rooms. They’re strong, have a bit of elasticity, and glide smoothly through machines. I keep a rainbow of these on hand for everyday projects—linen shirts, cotton dresses, even lightweight home decor. But don’t assume they’re perfect for everything. I once used all-purpose thread on a rayon challis blouse, only to find the seams puckering after the first wash. Why? Rayon has no give, and the slight stretch in the thread created tension. Lesson learned: even “all-purpose” has limits.

Cotton

Cotton thread is strong, lint-free, and finishes with a soft, silky luster. It’s ideal for natural fiber fabrics like cotton, linen, and rayon. When I’m piecing quilts from Pura Fabric’s organic cotton line, I reach for 100% cotton thread—it behaves like the fabric, shrinking and aging together. But avoid it on knits. A client once stitched a jersey dress with cotton thread and complained that the seams burst at the shoulders. Cotton has zero stretch, so under tension, it snapped. Switch to polyester, and the problem vanished.

Hand Quilting

Hand quilting thread is mercerized cotton, tightly twisted and coated for smooth passage through multiple fabric layers. The coating reduces friction, so your needle pulls cleanly through batting and backing without shredding. I use this when hand-stitching heirloom quilts from Pura Fabric’s vintage-inspired prints. Without the coating, the thread would fuzz and drag, making each stitch a battle. One tip: run the thread through beeswax lightly. It further reduces tangling and adds strength.

Machine Quilting

This 100% cotton thread is designed for speed and durability under a machine needle. It has the same luster as hand quilting thread but is engineered to withstand high-speed stitching. For long-arm quilting, especially on dense cotton sateen or canvas-backed quilts, this thread holds up without breaking. I once tried using regular cotton thread on a king-sized quilt and had to stop every few minutes to rethread. Switching to machine quilting thread cut my tension issues in half.

Silk

Fine and supple, silk thread is a luxury few realize they need—until they try basting a delicate wool coat. It’s strong for its weight and slides through fabric without leaving perforations. I use it for tailoring projects involving Pura Fabric’s wool crepe or silk dupioni. One winter, I basted a coat with polyester thread, only to find tiny, permanent holes when I removed the basting. Silk wouldn’t have done that. It’s also excellent for rolled hems on lightweight silks—no bulk, no damage.

Heavy Duty / Upholstery / Strong Outdoor

When sewing outdoor cushions from Pura Fabric’s Sunbrella®-grade canvas, I never reach for anything less than 100% polyester heavy-duty thread. It resists UV degradation and won’t rot when exposed to moisture. I once made patio pillows with all-purpose thread. After one summer, the seams split. Switched to UV-resistant outdoor thread, and they’ve lasted five years. For leather or vinyl, the thread must handle abrasion—this one does. Just remember: use a leather needle and slow down your machine speed to prevent shredding.

Jeans or Top Stitch

This thick, durable thread gives that bold, professional look on denim and canvas. I use it for topstitching on Pura Fabric’s indigo selvedge denim—paired with a size 100/16 needle, it creates clean, defined seams. But don’t try it with a standard needle; I learned that the hard way when my machine jammed mid-stitch. The thread is too thick for small needle eyes. Always upgrade your needle size and check your machine’s tension settings. And for the bobbin? Stick with all-purpose—no need to overload the underside.

Button & Carpet

This is for heavy handwork—attaching coat buttons, repairing rugs, or hand-sewing leather straps. It’s coated to resist tangling, which is a lifesaver when working with thick layers. I once reattached a vintage coat button with regular thread. It lasted two wears. Switched to button thread, and it’s held for three winters. The coating also helps it glide through tightly woven fabric without fraying.

Machine Embroidery

Rayon or polyester embroidery thread has a brilliant sheen and smooth finish, perfect for decorative work. But it’s not for seams. I once used it to stitch a collar, and the thread shredded under stress. Embroidery thread lacks the tensile strength for construction. Use it only for surface design. And in the bobbin? Use lightweight polyester bobbin thread in white or black—it balances the top thread without adding bulk.

Invisible / Transparent

Nylon or polyester transparent thread is ideal when you want stitches to disappear. I use it for hemming sheer curtains or attaching lace appliqués on delicate fabrics. But be careful: nylon melts under a hot iron. I once pressed a hem and fused the thread into the fabric. Now I always test with a scrap first. Also, over time, nylon can become brittle—especially with frequent washing. For heirloom pieces, I prefer polyester-based invisible thread; it lasts longer.

Metallic

Metallic thread adds sparkle to embroidery and decorative stitching, but it’s fragile. It breaks easily, especially under tension. I once stitched a holiday table runner and had to rethread every three inches. The fix? Sewer’s Aid—a lubricant that reduces friction. I also slow my machine speed and use a larger needle (size 90/14) with a bigger eye. And I never backstitch—instead, I tie off threads by hand. It’s finicky, but when done right, the results are stunning.

Other Tips

Always match your thread fiber to your fabric when possible. Cotton thread on cotton fabric, polyester on synthetics. When in doubt, go one or two shades darker. A slightly darker thread blends better than a lighter one, which tends to stand out. I once used a pale thread on a navy linen jacket—every stitch showed. Switched to a deep navy, and the seams vanished.

When sewing stretchy fabrics like knits or spandex, use polyester thread. It has the give your fabric needs. Cotton thread will snap. I’ve seen so many serged knits fail because someone used the wrong thread in the bobbin. Even if the top thread is polyester, the bobbin thread must match.

Never use hand-sewing thread in your machine. It’s coated differently and designed for slower, manual tension. In a machine, it gums up the tension discs and breaks constantly. I once borrowed a spool from a friend’s hand-sewing kit—within minutes, my machine was jammed with lint and broken thread.

For most projects, use the same thread in the bobbin as in the needle. It balances tension and prevents looping. Exceptions? Machine embroidery—use lightweight bobbin thread. Topstitching—use all-purpose in the bobbin to reduce bulk. For heavy-duty sewing like canvas or upholstery, match the top and bobbin threads. I once used heavy top thread with all-purpose bobbin thread on a tote bag. The top stitches looked great, but the underside was loopy and weak. Switched to heavy-duty in both, and the bag held 50 pounds of books.

Final Thought

Thread is more than a seam binder—it’s a structural component of your sewing. Treat it with the same care as your fabric. At Pura Fabric, we stock projects that last, and that starts with the right thread choice. Test it, feel it, and trust your instincts. The machine will tell you when you’ve got it right.