How To · Fashion · Build
Master the tailoring basics every woman should know
Good tailoring isn't about perfection—it's about making your clothes actually fit your body. Here's what you need to know to get started, whether you're hemming a dress or taking in a blazer.
5 min read · IrisTailoring isn't magic—it's geometry applied to fabric. Whether you're shortening sleeves, taking in side seams, or adjusting a waistband, the same principles apply: measure twice, mark carefully, and sew with intention. Most alterations fall into three categories: hemming (shortening length), taking in (reducing width), and letting out (adding width). Understanding which tools to use and how to read your garment's construction will transform how your clothes fit.
The good news: you don't need a sewing machine to start. Hand-stitching simple hems is entirely achievable with a needle, thread, and patience. But if you plan to tackle multiple projects, investing in a basic machine and a small toolkit will save time and frustration. This guide covers the foundational skills that make the difference between a garment that fits and one that doesn't.
Tailoring is about working with your body, not against it.
What you'll need.
- 01Measuring tape (flexible, marked in both inches and centimeters)
- 02Fabric scissors (sharp, dedicated to fabric only)
- 03Tailor's chalk or fabric pen (washes out easily)
- 04Pins (ball-point or glass-head for visibility)
- 05Hand-sewing needles (size 7–10 for general work)
- 06Thread (neutral colors: black, white, navy, beige)
- 07Seam ripper (for removing old stitches)
- 08Sewing machine (optional but recommended for durability)
- 09Iron and ironing board (for pressing seams)
Step one · 2 minutes
Gather your tools and materials
You don't need much to start: a measuring tape, fabric scissors (sharp ones—never use kitchen scissors), tailor's chalk or a fabric pen, pins, hand-sewing needles, and thread that matches your garment. If you're hemming, grab a seam ripper to carefully open existing stitches. For machine work, you'll need a sewing machine with basic stitches and bobbins in neutral colors. Keep everything in one small box so it's accessible when you need it.
Invest in quality fabric scissors early. Dull scissors create frayed edges and frustration.
Step two · 3 minutes
Take accurate measurements on your body
Wear the garment you're altering with the shoes you'll wear it with. Have someone help you measure, or use a mirror to verify. Measure from the top of your shoulder to where you want the sleeve to end. For hems, measure from the floor up to where the garment should hit—typically knee-length for most dresses. Mark these measurements directly on the garment using tailor's chalk or a fabric pen. Double-check by measuring again. Precision here prevents costly mistakes.
Mark measurements on the inside of the garment so chalk marks don't show on the outside.
Step three · 5 minutes
Pin and try on before cutting or sewing
Use pins to temporarily adjust the garment to your marked measurements. If hemming, fold the fabric up to your chalk line and pin horizontally every 2–3 inches. Try it on and walk around. Check the length in natural light and from different angles. For side seams or sleeve adjustments, pin the excess fabric on the inside and assess the fit. This step is non-negotiable—it's your last chance to catch mistakes before permanent stitching.
Pin on the inside of the garment so you can see the final silhouette without pin marks.
Step four · 8 minutes
Hand-stitch a basic hem for simple projects
For a simple hem, thread your needle and tie a knot at the end. Starting at an inside seam, bring the needle up through the fold of the hem. Take a tiny stitch (about 1/8 inch) horizontally into the garment body, then bring the needle back into the fold and slide it along inside the fold for about 1/4 inch. Repeat this pattern all the way around. The stitches should be invisible from the outside. Use thread that matches your fabric color. This hand-stitch method works beautifully for lightweight fabrics, linen, and delicate materials.
Go slowly and keep stitches small and even. A wobbly hem is better than a rushed one.
Step five · 10 minutes
Machine-stitch for durability and speed
If using a sewing machine, set it to a straight stitch with matching thread. Fold the hem up to your marked line and press it flat with an iron to create a crease. Position the garment under the presser foot about 1/4 inch from the fold. Sew slowly, keeping the line straight. For side seams or sleeve adjustments, sew along the pinned line, removing pins as you go. Backstitch at the beginning and end to secure the seam. Machine stitching is faster and more durable than hand-stitching, making it ideal for everyday wear.
Use a seam ripper to carefully remove the old stitches before sewing new ones, especially on seams.
Step six · 3 minutes
Finish and press your work
After sewing, try on the garment one final time to confirm the fit. Trim any excess thread with scissors. If you hand-stitched, gently press the seam with an iron on low heat to set it. For machine-stitched seams, press the garment according to the fabric type—delicate fabrics need lower heat. Check that all stitches are secure and the alteration looks intentional. A quick press makes the difference between a DIY project and professional-looking work.
Always press from the inside of the garment to avoid shine marks on delicate fabrics.
How to know your tailoring worked
A successful alteration should feel invisible—the garment fits your body without pulling, bunching, or gaps. The hem should be even all the way around, and seams should sit smoothly without puckering. If you're wearing it, you shouldn't think about the fit.
Questions at the mirror.
My thread keeps breaking when I hand-stitch. What am I doing wrong?
Thread breaks when it's too long (use an arm's length), the needle eye is too small, or you're pulling too tightly. Cut shorter lengths, use a needle with a larger eye, and sew with gentle, even tension. Also check that your needle isn't bent or dull.
How do I know if a garment can be let out (made bigger)?
Look at the seam allowance—the fabric between the seam line and the cut edge. If there's at least 1 inch of extra fabric, you can usually let it out. Open the seam carefully with a seam ripper and re-sew it further out. Check the garment construction first; some pieces can't be altered.
Can I tailor a garment that's too small in the bust or shoulders?
Bust can sometimes be let out if there's enough seam allowance. Shoulders are trickier and often require professional help because they involve repositioning armholes. Start with side seams and underarm seams before attempting shoulder work.
What's the difference between a blind stitch and a running stitch?
A blind stitch (used for hems) is nearly invisible from the outside because the thread runs inside the fold of fabric. A running stitch is a simple in-and-out stitch visible on both sides. Use blind stitch for hems and running stitch for seams or visible decorative work.