What spaghetti straps are and why you sew them
Spaghetti straps are thin, cord-like shoulder straps made from a tube of fabric sewn inside-out and then turned right-side-out. They're common on summer dresses, tank tops, and lightweight garments because they're delicate-looking and comfortable to wear. You sew them by creating a long fabric tube, turning it through itself, and then attaching it to the armhole or neckline of your garment.
The technique takes about 30 to 45 minutes once you understand the steps, and the hardest part is turning the tube right-side-out without tearing it. Most home sewers can do this successfully on their first try if they follow the order of operations and use the right needle size for the fabric weight.
Key Takeaways
- Cut fabric strips on the bias (at a 45-degree angle to the grain) so the straps stretch slightly and lie flat against the shoulder.
- Sew the strip into a tube using a seam allowance of 1/4 inch, then turn it right-side-out by threading it onto a safety pin or bodkin.
- Press the tube flat with an iron so the seam sits centered on the back, then topstitch 1/8 inch from the edge if you want a finished look.
- Pin the straps to the armhole or neckline before attaching them, and sew them down with a 1/4-inch seam allowance using a straight stitch or narrow zigzag.
Cutting the fabric strips on the bias
Bias strips stretch more than strips cut along the grain, which means your finished straps will hug the shoulder without pulling. To cut on the bias, fold your fabric so that the selvage (finished edge) runs parallel to the crosswise grain—this creates a 45-degree angle. Mark a line at that angle using a ruler and fabric pencil, then cut strips that are 1 to 1.5 inches wide. For a pair of straps, you'll need two strips roughly 18 to 24 inches long, depending on the depth of your armhole and how much strap you want visible.
If your fabric has a pattern or nap (like velvet or corduroy), cut both strips in the same direction so they match when sewn. Check that your strips are straight by holding them up to the light—any waviness will show in the finished strap.
Sewing the tube and turning it right-side-out
Fold one strip in half lengthwise with the right sides facing each other, so the two long edges line up. Sew along the long edge using a 1/4-inch seam allowance and a straight stitch set to 2.0 to 2.5 millimeters in length. Use a needle size appropriate to your fabric—size 70/10 for lightweight cotton or linen, size 80/12 for medium-weight fabric, and size 90/14 for heavier materials. Backstitch at the start and end to lock the thread.
Now you have a tube with the seam on the outside. To turn it right-side-out, thread a safety pin or bodkin (a blunt needle with an eye) through the seam allowance at one end of the tube, then push it along the inside of the tube toward the other end. The safety pin will gradually pull the fabric through itself and turn the tube inside-out. This takes patience—push slowly and gently to avoid tearing the seam. Once the tube is turned, press it flat with an iron on medium heat, centering the seam on the back of the strap.
If you want a polished finish, topstitch 1/8 inch from each long edge using a straight stitch. This flattens the strap and makes it look professionally made. Repeat this entire process with the second strip.
Pinning the straps to the armhole or neckline
Decide where you want the straps to sit—typically 2 to 3 inches in from the side seam on each shoulder. Mark these points on the right side of your garment using a fabric pencil or tailor's chalk. Pin one end of each strap to these marks, with the strap facing down (seam-side down) and the raw edge of the strap aligned with the raw edge of the armhole or neckline. The strap should lie flat against the garment, not twisted.
Try on the garment and adjust the strap position if needed—the straps should sit comfortably on your shoulders without pulling. Once you're happy with the placement, pin the other end of each strap to the back armhole or neckline at the same distance from the side seam. Make sure both straps are the same length and sit at the same angle.
Sewing the straps to the garment
Sew the straps down using a 1/4-inch seam allowance, sewing through all layers: the strap, the garment fabric, and any facing or binding. Use a straight stitch or a narrow zigzag (width 1.5 to 2.0 millimeters, length 2.0 to 2.5 millimeters) to prevent the seam from splitting when you wear the garment. Sew slowly and backstitch at the start and end.
For extra durability, sew the strap down twice—once at the 1/4-inch line, then again at 1/2 inch from the edge. This creates a box-stitch pattern that distributes the stress across a wider area. Trim any excess seam allowance to 1/8 inch and finish the raw edges with a zigzag stitch or pinking shears to prevent fraying.
Common mistakes and how to avoid them
The most common error is sewing the tube seam too wide, which makes the finished strap too thick and stiff. Stick to 1/4 inch and you'll have a strap that drapes naturally. Another mistake is turning the tube too quickly or roughly, which tears the seam—go slowly with the safety pin and stop if you feel resistance.
Some sewers pin the straps with the seam facing up, which shows the seam on the finished garment. Always pin with the seam facing down so it's hidden. Finally, don't skip the pressing step—a pressed strap looks professional and lies flat, while an unpressed strap will twist and bunch when you wear it.
Finishing the neckline or armhole after the straps are attached
Once the straps are sewn, you'll need to finish the raw edges of the neckline or armhole. The most common method is a bias binding—a strip of fabric folded and pressed to wrap around the edge. Cut a bias strip 1.5 to 2 inches wide and long enough to go around the entire neckline or armhole plus 1 inch for overlap. Fold it in half lengthwise and press, then wrap it around the edge so the raw edges of the binding align with the raw edges of the garment and straps.
Sew the binding down using a 1/4-inch seam allowance, then fold it to the inside of the garment and hand-stitch it down using a ladder stitch or whip stitch. This creates a clean, professional finish that won't fray in the wash. If you prefer a simpler finish, you can use a narrow zigzag stitch around the raw edges and call it done—this is less formal but faster and still functional.
Frequently Asked Questions
Can I make spaghetti straps from a different fabric than the garment?
Yes. Contrasting fabric can look intentional and stylish. Just make sure the weight is similar—a heavy linen strap on a lightweight cotton dress will pull and distort the neckline. Test the combination by sewing a sample strap and trying it on before committing to the full garment.
What if my tube tears while I'm turning it right-side-out?
If the tear is small (less than 1/2 inch), you can hand-stitch it closed with a ladder stitch once the tube is turned. If the tear is large, cut the tube in half at the tear, turn both pieces, and sew them together end-to-end with a 1/4-inch seam allowance. You'll lose a little length, but the strap will still work.
How do I know if my straps are the right length?
Try on the garment with the straps pinned in place before you sew them. The straps should sit comfortably on your shoulders without pulling or sagging. If they're too short, you'll feel tension; if they're too long, they'll slip. Mark the correct length with a pin and measure from that pin to the raw edge of the strap.
Do I need to use a special needle for sewing straps?
A universal needle in the correct size for your fabric works fine. Use size 70/10 for lightweight fabrics, 80/12 for medium-weight, and 90/14 for heavier materials. If you're sewing through multiple layers (strap plus garment plus facing), you may want to go up one size to prevent the needle from bending.
Can I attach spaghetti straps to a finished garment?
Yes, but it's easier if the neckline or armhole isn't yet finished. If the edge is already bound or hemmed, you'll need to carefully open a small section of the binding, insert the strap, and re-stitch the binding closed. This takes extra time and care, so it's worth finishing the straps before you bind the neckline whenever possible.