I'll never forget the 1920s silk day dress I found at an estate sale last year, tucked under a pile of wool coats in the back of a forgotten closet. The floral print was still vibrant, the darts were perfectly fitted to a 1920s silhouette, but every single original buttonhole was frayed to the point of falling apart---someone had tried to fix one with a thick modern machine buttonhole years prior, and the stiff, bulky stitch had pulled the delicate silk thread so hard it left permanent gaping holes along the entire front placket. I almost did the same thing, until my vintage sewing mentor talked me out of it, and walked me through the period-appropriate techniques that turned that dress into a wearable piece I've worn to half a dozen vintage events since.
If you're restoring antique garments, buttonholes are the make-or-break detail: the wrong technique will ruin fragile fabric, stick out like a sore thumb against original construction, and fall apart after a single wear. The right techniques, though, will preserve the garment's integrity, keep it functional for decades, and honor the work of the original seamstress who sewed it 50, 100, or 150 years ago.
First, Match the Original Construction to Your Garment
Don't just reach for your machine's automatic buttonhole setting the second you see a frayed placket. Start by identifying what type of buttonhole the garment originally had, so your repair matches as closely as possible. Check the inside of the garment first: if you see raw edges bound with a narrow strip of matching fabric, it's a bound hand-worked buttonhole, standard for 19th century tailored coats, wool walking skirts, and heavy linen day dresses. If the inside of the buttonhole is a smooth folded facing with no raw edges, it's a faced buttonhole, the go-to for 1930s silk blouses, 1940s utility wear, and 1950s linen shirtwaists. If the stitches are perfectly even, dense, and uniform, it's likely a machine-made buttonhole from the early 20th century, sewn with a vintage machine attachment rather than a modern automatic foot.
For extremely fragile fabrics like 18th century linen or 1920s crepe de chine, avoid removing any original remnant of the buttonhole if you can help it---use the frayed edges as a guide for size and placement, and work around them to preserve as much of the original construction as possible. Always measure the spacing between existing intact buttonholes first, too: vintage garments rarely have evenly spaced buttonholes, and placing a new one even a half-inch off will throw off the entire fit of the garment.
Bound Hand-Worked Buttonholes for 19th Century and Tailored Vintage Pieces
Bound buttonholes are the most durable, period-appropriate option for heavy woven fabrics like wool, linen, and twill, and they're far easier to sew than they look. Start by cutting your binding on the true bias from the same fabric as the garment (or a period-appropriate matching fabric if the original is too worn to use) in a ½-inch wide strip, long enough to wrap around the entire perimeter of the buttonhole with a ¼-inch overlap at the ends.
Baste the exact placement of your new buttonhole first, using silk thread that matches the original thread weight---silk is strong enough to hold through heavy fabric, but fine enough that it won't leave permanent holes if you need to pick the basting out later. If the original buttonhole opening is still intact, use it as your template; if it's too frayed to use, cut a new slit with sharp fabric scissors, making it exactly the same width as the original buttonhole plus ⅛ inch to account for the binding. Wrap the bias binding around the raw edges of the slit, clipping it in place (skip pins for fragile fabrics, use tiny wonder clips that won't leave holes) then stitch the binding to the fabric with a tiny, even buttonhole stitch (a tight, narrow blanket stitch variant) using a sharp size 10 embroidery needle. Keep your stitches small and uniform---no bulky, loopy stitches that will catch on other fabric or skin.
When you reach the end of the binding, overlap the raw edges by ¼ inch, tuck them under, and whipstitch them closed with tiny, invisible stitches so no raw edges are exposed. For extra durability on wool coats, you can lightly felt the edges of the binding with a felting needle to seal the fibers and prevent fraying, a trick original 19th century tailors used regularly. The finished buttonhole will lie completely flat against the fabric, no bulk, and will stretch and move with the garment just like the original.
Faced Buttonholes for 1930s--1950s Delicate Garments
Faced buttonholes are the standard for lighter, more delicate vintage pieces like silk blouses, rayon dresses, and linen shirtwaists, because they have no raw edges and lie completely smooth against the right side of the fabric. Start by cutting a facing from the same fabric as the garment, 1 inch wider and longer than the buttonhole opening you need. Pin the facing to the wrong side of the garment, right sides together, along the line where the buttonhole will go, then stitch a narrow ¼-inch seam along that line. Cut a slit down the center of the stitched line, stopping ⅛ inch from each end, then press the facing through the slit to the right side of the fabric, using a pressing cloth to avoid scorching delicate fabrics like rayon or silk.
Fold the raw edges of the facing under ¼ inch, press again, then stitch the facing down to the wrong side of the garment with tiny, invisible slip stitches, or a narrow zigzag stitch on a vintage sewing machine if you want the stitch to be slightly visible to match original factory construction. If the original facing is still mostly intact but frayed at the edges, don't remove it---instead, cut a small patch of sheer silk organza or cotton lawn, pin it to the wrong side of the frayed facing, and stitch around the edges of the buttonhole to reinforce it, so you keep as much of the original fabric as possible. Avoid fusible interfacing at all costs: the glue will seep through delicate vintage fabrics over time, leaving permanent stains and breaking down the fibers. If you need extra support for a very lightweight fabric, use a thin sew-in silk organza interfacing instead, which is completely removable and won't damage the fabric.
Era-Appropriate Machine Buttonholes for Early 20th Century Workwear
If you're restoring a 1910s work dress, 1940s utility shirt, or 1950s children's playwear that originally had machine-made buttonholes, skip your modern automatic buttonhole foot---its stitch density is too tight, and the finished buttonhole is too stiff to match the flexible, functional original. If you have a vintage Singer 15, 66, 99, or 201, dig out the original buttonhole attachment that came with the machine: these attachments make buttonholes with the exact same stitch length, density, and flexibility as the originals, and they're designed to work with the lightweight cotton and knit fabrics common in early 20th century workwear.
If you don't have the vintage attachment, you can replicate the look manually: set your machine to a narrow 2mm zigzag stitch, sew one side of the buttonhole, then the other, then use a sharp seam ripper to cut the slit down the middle. Reinforce each end of the buttonhole with tiny, even bar tacks, matching the stitch length of the rest of the garment, just like factory workers did in the 1940s. For knit vintage garments like 1930s wool sweaters or 1950s cotton jersey dresses, use a stretch zigzag stitch for your buttonholes, so they move with the fabric without popping when you button and unbutton the garment.
Pro Tips for Preserving Fragile Fabric While You Work
Antique fabrics are far more delicate than modern sewing supplies, so a few small adjustments will save you from ruining a rare piece mid-repair. First, always test your buttonhole technique on a scrap of the same fabric, or a hidden seam allowance of the garment, before you work on the visible placket---this lets you adjust your stitch length, tension, and needle size to make sure you don't pull or tear the fabric. Second, use the finest sharp needle possible for your fabric: a size 10 or 12 sharp needle for silk and lightweight cotton, a size 14 for wool and linen, so you don't leave large needle holes in the fabric. Third, for extremely fragile fabrics that are prone to tearing, reinforce the area around the buttonhole with a layer of sheer sew-in interfacing on the wrong side before you cut the slit or stitch the binding, so the fabric doesn't rip when you're working on it. The interfacing will be completely invisible from the right side, and it will add just enough support to keep the buttonhole from stretching out over time.
The best part of restoring vintage buttonholes isn't just ending up with a wearable garment---it's stepping into the shoes of the original seamstress who sewed those buttonholes 50, 100, or 150 years ago, using many of the same techniques and tools they used. I still have that 1920s silk dress I restored, and every time I button it up, I think about the woman who sewed it in the 1920s, probably hemming it in her parlor after a long day of work, making sure every buttonhole was perfect. Last month, I wore it to a vintage tea dance, and not a single person noticed the repairs---because the buttonholes matched the original construction so well, they looked like they'd been there the whole time. If you're new to vintage garment restoration, start with a cheap 1950s linen dress to practice faced buttonholes before you tackle a rare Victorian piece, and always prioritize preserving as much of the original fabric and construction as possible. Your future self, and the original maker of the garment, will thank you.