What you need before you start

Sewing a t-shirt requires fabric, a pattern, thread, and a sewing machine—but the specific items depend on whether you are working from a commercial pattern or drafting your own. Most beginners buy a t-shirt pattern from a fabric store or read one online, then purchase fabric that matches the pattern's yardage requirement (usually 1.5 to 2.5 yards for an adult shirt). You will also need thread in a color that matches or blends with your fabric, a needle for your machine, scissors or a rotary cutter, pins, and a measuring tape.

The fabric itself matters more than you might think. Cotton jersey, a stretchy knit, is the standard choice for t-shirts because it moves with your body and is forgiving if your seams are not perfectly straight. Avoid stiff woven fabrics for your first shirt—they require different techniques and are harder to fit. If you have never sewn before, a pattern labeled "beginner" or "straightforward" will have fewer pieces and simpler construction than a fitted or tailored design.

Key Takeaways

  • A t-shirt pattern, fabric, thread, and a sewing machine are the core tools; most patterns require 1.5 to 2.5 yards of knit fabric.
  • Cutting accurately from the pattern pieces is the foundation—misaligned cuts compound into fit problems later.
  • Sewing the shoulder seams first, then the neckline binding, then the side seams and sleeves keeps the shirt stable as you work.
  • Stretchy knit fabric needs a ballpoint needle and a stretch stitch or narrow zigzag to prevent seams from breaking when you wear the shirt.
  • Hemming the sleeves and bottom by folding the fabric twice and stitching creates a professional finish that lasts through washing.

Preparing your pattern and fabric

Lay out your pattern pieces on the fabric according to the layout diagram that comes with the pattern. The diagram shows you how to arrange the pieces to use the least fabric and to align the grain line (the direction of the weave) correctly—this matters because fabric behaves differently along the grain than across it. Pin the pattern pieces to the fabric, then cut around them with sharp scissors or a rotary cutter. Cut slowly and follow the outline exactly; a wobbly cut on the armhole will show in the finished seam.

Before you sew, mark the notches (small cuts or symbols on the pattern) onto your fabric pieces. These notches tell you where seams should meet and where to attach sleeves. You can mark them with tailor's chalk, a fabric pen, or by making small snips into the seam allowance (the margin of fabric beyond the cutting line). Transfer any other markings the pattern calls for—dart lines, center front and back lines, or placement marks for pockets or hems.

Sewing the shoulder seams and neckline

Start by sewing the front and back pieces together at the shoulders. Place the pieces with right sides together (the pretty sides facing each other), align the shoulder edges, and pin them. Use a ballpoint needle and a stretch stitch or narrow zigzag stitch on your machine—a regular straight stitch will snap when the fabric stretches. Sew with a 5/8-inch seam allowance (the standard for most patterns) and backstitch at the beginning and end to lock the thread.

Once the shoulders are sewn, attach the neckline binding. Most patterns include a binding strip—a narrow piece of knit fabric that finishes the neckline edge. Fold the binding in half lengthwise with wrong sides together, then pin it to the neckline opening with the raw edges aligned. Sew the binding to the neckline using a stretch stitch, then fold it to the inside of the shirt and stitch it down from the inside. This creates a smooth, stretchy edge that will not curl or fray.

Attaching the sleeves and sewing side seams

Sleeves go in before you close the side seams. Pin the sleeve cap (the curved top of the sleeve) to the armhole, matching the notches and the shoulder seam. The sleeve should fit smoothly into the armhole without puckering; if it does pucker, you may have pinned it unevenly. Sew the sleeve in place with a stretch stitch, then sew the other sleeve the same way.

Now sew the side seams and the underarm seams in one continuous line. Pin the front and back pieces together along the side, then pin the front and back sleeve pieces together along the underarm. Sew from the hem of the shirt up through the underarm and out to the cuff in one seam, using a stretch stitch. Repeat on the other side. This creates a strong, continuous seam that will not come apart at the underarm, where t-shirts take the most stress.

Hemming the sleeves and shirt bottom

Measure and mark where you want the sleeves to end—usually about 1 inch above your wrist bone when your arm is at your side. Fold the sleeve edge up 1/2 inch with wrong sides together, press it flat with an iron, then fold it up another 1/2 inch and press again. This double fold hides the raw edge inside the hem. Pin the fold in place and sew it with a stretch stitch, keeping the stitches close to the inner fold so they do not show on the outside.

Hem the bottom of the shirt the same way: fold up 1/2 inch, press, fold up another 1/2 inch, press, pin, and sew. Try the shirt on before you sew the final hem to make sure the length is right. Once you have sewn both hems, try the shirt on again, wash it in warm water, and dry it on low heat to see how it fits and how the seams hold up.

Finishing touches and troubleshooting

After the shirt is complete, trim any loose thread ends with scissors. If you see puckering along a seam, it usually means the fabric was stretched as you sewed—this happens most often on the armhole or neckline. You can prevent it by using a walking foot (a presser foot that feeds fabric evenly) or by sewing slowly and not pulling the fabric. If a seam has already puckered, you can sometimes smooth it out by pressing it with steam, but if the damage is severe, you may need to rip out that seam and sew it again.

If the shirt feels tight in the shoulders or chest after you wash it, the fabric may have shrunk, or you may have cut the pattern pieces too small. Check the pattern size against your measurements before you cut next time. If the sleeves twist or the neckline gaps, the pattern may not be the right size for your body—this is common and does not mean you made a mistake. Keep notes on what fit and what did not so you can adjust the next shirt you make.

Frequently Asked Questions

Can I use a regular sewing machine, or do I need a serger?

A regular sewing machine is fine. A serger (an overlock machine) finishes the raw edges and looks professional, but it is not necessary. You can sew a t-shirt entirely on a regular machine using a stretch stitch or narrow zigzag, and the shirt will wear well. A serger is a nice-to-have, not a must-have.

What happens if I sew with a straight stitch instead of a stretch stitch?

The seams will break when you wear the shirt, especially under the arms where the fabric stretches the most. Knit fabric moves, and a rigid straight stitch cannot move with it. Always use a ballpoint needle and a stretch stitch or narrow zigzag when sewing knits.

How do I know what size pattern to buy?

Measure your chest at the fullest point and compare it to the finished measurements listed on the pattern envelope, not the size number. A size medium pattern might have a finished chest of 38 inches, while a size large has 40 inches. Choose the size that matches your measurement or is 1 to 2 inches larger for a comfortable fit.

Can I make a t-shirt without a pattern?

You can draft your own pattern by measuring an existing t-shirt you like and drawing the pieces on paper, but this takes practice and is harder than following a commercial pattern. For your first shirt, use a pattern—it removes the guesswork and gives you a better result.

Why does my neckline binding look wavy or puckered?

The binding was probably stretched as you sewed it to the neckline. Pin the binding carefully so it lies flat, and sew slowly without pulling. If the binding is already puckered, you can sometimes smooth it by pressing with steam, but prevention is easier than fixing it after the fact.