The thread shank, and here's why it matters
Okay. Last time we sewed a flat button on so it lasts. Today we're doing the same button, basically, but with one difference that matters more than almost anything else in this whole module: the shank.
A shank is just the little stem of thread between the button and the fabric. Coats and jackets often have buttons with a built-in metal or plastic shank underneath — you can feel it if you flip the button over. But a flat, sew-through button, the four-hole kind on shirts and blouses, has no shank of its own. You have to build one out of thread. And here's why that matters: fabric has thickness. A buttonhole has to close around the button AND around the layer of fabric behind it. If you sew that button on flat and tight, right against the shirt, the button can't move, the fabric can't wrap around it properly, and the buttonhole either won't close or it strains every time you try. You'll be back here in three weeks with the same button in your hand.
How to build one
You're going to do everything the same as last lesson, up through positioning the button and starting your stitches. The difference happens while you're sewing.
- Pin the button in place like normal.
- Before your first stitch, lay something flat under the button between it and the fabric — a toothpick, a matchstick, even a spare needle laid sideways. I use a toothpick most of the time, it's what's in the junk drawer.
- Sew through the holes and over that toothpick, same as you'd sew the button on flat. Four or five passes per hole-pair, like we practiced.
- When you're done stitching through the holes, do NOT tie off yet. Pull the toothpick out. You'll see the button is sitting up off the fabric with a little gap of thread underneath — that's your shank space.
- Now bring your needle up between the button and the fabric, into that gap.
- Wrap the thread around those threads underneath the button, tight, five or six times, working down toward the fabric. This is the actual shank. You're binding those loose threads into one firm little post.
- Take the needle through to the back of the fabric and tie off the way we practiced — small stitches, a couple of them, not one giant knot sitting on top of everything.
That wrapping step is the part I make people do twice. Not because it's hard. Because everyone rushes it the first time and does two wraps instead of six, and two wraps is not a shank, it's a suggestion.
Why I'm particular about this
Here's my honest opinion and I'll stand behind it: a slightly crooked button that stays on beats a shirt in the landfill, every time. You don't need to be an expert seamstress for any of this. But the shank is the one spot where a little extra care changes whether this mend lasts through Tuesday or through two years of washes, and it costs you maybe ninety extra seconds.
A word about paying attention
I'll tell on myself here. Years back I was hemming curtains, humming along to the radio — badly, my family will confirm — and not paying one bit of attention to my hands. Put the needle straight through my thumb. Not deep, thank goodness, but enough to make me yelp and drop everything.
I tell people now: the needle waits for you to pay attention, and it will get your attention one way or another. Wrapping thread around a toothpick right next to your fingers, pulling that toothpick back out with a needle still live in your other hand — that's exactly the kind of moment where your mind wanders and the needle finds a finger instead of fabric. Slow down for the wrap. You can hum along to the radio during the parts that don't require your fingers near a sharp object. This part isn't one of them.
A couple of troubleshooting notes
If your shank comes out too long and the button flops around, you didn't wrap tight enough or you used something too thick as a spacer. Toothpick, not a pencil.
If the button still sits too tight against the fabric after all this, check that you actually pulled the spacer out before wrapping. People forget. I've forgotten. Oh my heck, more than once.
Before next time
Bring one more button-down shirt if you've got one — we're going to do a whole shirt's worth next lesson, all the buttons in one sitting, so bring your patience along with the shirt. 🌷
- V