What You Need to Know Before You Start

A bralette is a soft, unstructured bra without underwire or padding. It is simpler to sew than a traditional bra because it uses fewer pieces and no rigid components. If you can sew a straight seam and attach elastic, you can make a bralette. Most beginners finish one in an afternoon or two.

The basic structure is two cup pieces, two side pieces, and a band that runs around your ribcage. You will need a pattern — either one you buy or one you draft from your measurements. The pattern tells you how many pieces to cut and what size they should be. Without a pattern, your bralette will not fit.

Bralette sewing differs from regular garment sewing mainly in the use of stretch fabrics and elastic. Stretch fabric moves with your body, so you need a sewing machine that can handle it — either a machine with a stretch stitch setting or a serger. A regular straight stitch will snap when the fabric stretches. You will also work with smaller seam allowances (usually half an inch or less) and attach elastic in ways that keep it flat and comfortable against skin.

Key Takeaways

  • You need a pattern sized to your bust and underbust measurements before you cut any fabric.
  • Bralette fabric must be a two-way or four-way stretch material like spandex blends, not woven cotton.
  • Your sewing machine must have a stretch stitch or you should use a serger, because a regular straight stitch will break when the fabric moves.
  • Elastic is sewn into seams and along edges using a zigzag or stretch stitch, not a straight stitch.
  • Most bralettes are hand-finished at the neckline and armholes with a binding or fold-over elastic rather than a facing.

Choosing the Right Fabric and Notions

Bralette fabric must stretch. Use a two-way or four-way stretch knit — typically a nylon-spandex blend, cotton-spandex blend, or performance fabric. Test the stretch by pulling a scrap: it should bounce back to its original shape. Woven cotton, linen, or canvas will not work because they do not stretch and will be uncomfortable and restrictive.

Most bralette patterns call for 1 to 1.5 yards of fabric depending on cup size. Buy a little extra because stretch fabrics can be slippery and you may need to recut a piece. Check the pattern for the exact yardage before you purchase.

You will also need elastic. Bralette patterns typically use quarter-inch or half-inch wide elastic — either standard elastic or fold-over elastic (FOE). Fold-over elastic is easier for beginners because it folds over the raw edge and does not require a facing. You will need elastic for the neckline, armholes, and underband. The pattern will tell you how much.

Thread should match your fabric color or be a neutral shade. Use polyester or cotton-wrapped polyester thread rated for stretch fabrics.

Taking Your Measurements and Choosing a Pattern

Bralette fit depends on two measurements: your bust (the fullest part of your chest) and your underbust (directly under your bust where the band sits). Measure yourself wearing an unpadded bra or no bra, standing straight, and not pulling the tape tight. Write both numbers down.

Bralette patterns are sized by bust measurement, usually in two-inch increments (32, 34, 36, 38, and so on). Choose the size that matches your bust measurement. If you are between sizes, pick the smaller one — stretch fabric will give you room.

You can buy patterns from independent designers on Etsy, from major pattern companies like Simplicity or McCall's, or from specialty lingerie pattern sites. Many designers offer free or low-cost PDF patterns you read and print at home. Read the reviews before you buy: other sewers will tell you if the fit is true to size or if the instructions are clear.

Print the pattern on your home printer or at a print shop. The pattern will come with a scale guide — a small ruler printed on the first page. Measure that ruler with a real ruler to make sure your printout is the correct size. If it is not, adjust the print settings and print again.

Cutting and Preparing Your Pieces

Lay your fabric on a flat surface with the stretch running vertically (up and down). Pin the pattern pieces to the fabric using ballpoint pins or pattern weights — regular pins can snag stretch fabric. Cut slowly with sharp scissors or a rotary cutter. Stretch fabric frays less than woven fabric, but a clean cut still matters for seam strength.

Mark the notches and dots on your pattern pieces using a fabric pen or tailor's chalk. These marks tell you where seams meet and where elastic goes. Do not skip this step — the marks keep you from sewing pieces together backwards or upside down.

Before you sew, test your machine on a scrap of your bralette fabric. Set the stitch to a stretch stitch (usually labeled as a lightning bolt or wavy line on your machine dial) and sew a line. Pull the seam gently. If the thread breaks, your machine is not set correctly. Check the manual for your machine's stretch stitch settings, or use a serger if you have one.

Sewing the Cup and Side Seams

Start by sewing the two cup pieces together at the center front seam. Place the pieces right sides together (the pretty sides facing each other), pin along the seam line, and sew using your stretch stitch. Use a seam allowance of half an inch unless your pattern says otherwise. Sew slowly — rushing causes puckered seams in stretch fabric.

Press the seam open with a warm iron. Do not use high heat on spandex blends, as heat can damage the elastic fibers. A medium setting is safer.

Next, attach the side pieces. Pin one side piece to the cup piece, matching the notches. Sew the seam using your stretch stitch. Repeat on the other side. You now have the main cup structure.

Try the bralette on inside out to check the fit across your bust and shoulders. If it is too tight or too loose, you may need to adjust the seam allowance on your next attempt. A quarter-inch wider seam makes the bralette larger; a quarter-inch narrower seam makes it smaller. Write down any changes before you remove the bralette.

Attaching the Underband and Elastic

The underband is the piece that wraps around your ribcage. Pin it to the bottom of the cup pieces, right sides together, matching the notches. Sew this seam with your stretch stitch. Press the seam open.

Now you will attach elastic to the neckline, armholes, and underband. If you are using fold-over elastic, fold it in half lengthwise and slide the raw edge of the fabric into the fold. Pin it in place and sew using a zigzag stitch or stretch stitch. The elastic should be slightly stretched as you sew — this keeps it from bunching. Stretch the elastic gently with your fingers as you feed the fabric under the presser foot.

If you are using standard elastic, pin it to the wrong side of the fabric (the inside), sew it down with a zigzag stitch, then fold it to the inside and sew again from the right side using a stretch stitch. This creates a neat, finished edge.

Start with the underband elastic because it is the easiest to handle. Work your way up to the armholes, then finish with the neckline. Take your time at the neckline — this is where fit is most visible.

Finishing and Trying On

Once all elastic is attached, try the bralette on right side out. Check that the neckline sits where you want it, the armholes do not dig into your shoulders, and the underband is snug but not tight. You should be able to fit one finger under the band comfortably.

If the neckline is too loose or too tight, you can adjust it by removing the elastic and resewing it with a slightly different stretch. Loosen the stitches with a seam ripper, remove the elastic, and sew it again with more or less stretch as needed.

Trim any loose threads and give the bralette a gentle wash in cool water by hand. Lay it flat to dry. Do not put it in the dryer — heat will damage the spandex.

Frequently Asked Questions

Can I use a regular sewing machine with a straight stitch?

Not for the seams. A straight stitch will snap when the stretch fabric moves. You need a stretch stitch setting on your machine or a serger. However, you can use a straight stitch to attach elastic if you use a zigzag stitch instead — the zigzag allows the thread to flex with the fabric.

What if my bralette is too tight after I sew it?

You can let out the seams by removing stitches with a seam ripper and resewing with a wider seam allowance. Move the seam line outward by a quarter inch on each side seam. This adds half an inch to your bust measurement. If it is still too tight, you may need to choose a larger pattern size next time.

Do I need to line the cups?

No. A bralette is unlined by design. If you want more coverage or opacity, choose a thicker or darker fabric, or sew two layers of fabric together before you cut the pattern pieces.

How do I keep the elastic from rolling or twisting?

Stretch the elastic slightly as you sew it, and use a zigzag or stretch stitch rather than a straight stitch. A straight stitch is too rigid and causes elastic to curl. Also, make sure you are sewing the elastic flat against the fabric, not bunched up.

Can I add padding or underwire to a bralette?

You can add light padding by sewing a layer of foam to the inside of the cup pieces before you assemble them. Underwire is not recommended for a bralette because the whole point is a soft, unstructured fit. If you want support, a traditional wired bra is a better choice.