How To · Fashion · Outfit Formulas
The Complete Guide to Tailoring Your Own Clothes
A needle and thread are cheaper than a tailor, and basic alterations are far simpler than you think. Here's exactly how to adjust hems, take in seams, and fix common fit issues on your own.
5 min read · IrisProfessional tailoring costs add up fast—especially when you're adjusting basics like jeans, dresses, and button-ups. The good news: most common fit problems can be solved with a needle, thread, and about thirty minutes of focused work. You don't need a sewing machine or advanced skills. Hand-stitching is quieter, more forgiving, and gives you precise control over seams that machines sometimes bungle.
This guide covers five essential alterations that will transform how your clothes fit: hemming pants and skirts, taking in side seams, shortening sleeves, tapering legs, and fixing gaping buttons. Each technique uses the same basic stitch and builds confidence for tackling more complex projects later.
Hand-stitching is quieter, more forgiving, and gives you precise control over seams that machines sometimes bungle.
What you'll need.
- 01Hand-sewing needle (size 7 or 8 for most fabrics)
- 02All-purpose thread in neutral colors
- 03Measuring tape
- 04Tailor's chalk or fabric pencil
- 05Small sharp scissors
- 06Pins
- 07Iron and ironing board
Step one · 3 minutes
Measure twice, mark once
Put on the garment and have someone pin or mark where it needs to be shortened or taken in—or use a mirror and mark it yourself with tailor's chalk or a fabric pencil. Measure from the original seam or hem line to your mark. Write down the measurement. Remove the garment and lay it flat on a clean surface. Measure again from the seam to your mark to confirm accuracy. This prevents the common mistake of cutting too much fabric.
Always measure on the body first, then verify on the flat garment. Fabric behaves differently when worn versus laid flat.
Step two · 2 minutes
Thread your needle and tie a knot
Cut an arm's length of thread and thread it through your needle. Tie a small knot at the end—this prevents the thread from pulling through the fabric as you stitch. For most alterations, use thread that matches your garment color exactly. If you can't find a match, choose one shade darker rather than lighter. A single strand works for lightweight fabrics; double it for heavier materials like denim or wool.
Wet the thread end slightly before threading the needle—it slides through more easily and frays less.
Step three · 8 minutes
Master the slip stitch for invisible hems
Fold the hem to your marked line and press with your fingers or a hot iron to create a crisp crease. Fold the raw edge of the fabric up about half an inch inside the garment and press again. Starting at a seam, bring your needle up through the fold of fabric so the knot catches inside. Take a tiny stitch (about one-eighth inch) directly into the garment body, then slide the needle through the fold for about a quarter inch before bringing it back out. Repeat this pattern—stitch into the body, slide through the fold—all the way around. Your stitches should be invisible from the outside.
Keep stitches small and consistent. Uneven tension creates puckering; too-large stitches will show and catch on things.
Step four · 10 minutes
Take in side seams for a slimmer fit
Try on the garment inside-out and have someone pin the side seams to fit your body. The new seam line should be parallel to the original seam, not angled. Mark the new line with tailor's chalk. Remove the garment and try it on again to confirm the fit—this is your last chance to adjust. Using a backstitch (push the needle backward through the fabric, then forward again in one motion), sew along your marked line. Start and end at existing seams. Try it on right-side-out. If it fits, trim the excess fabric to about half an inch from your new seam and finish the raw edge with a zigzag stitch by hand or machine.
Never take in more than half an inch per side seam, or you'll distort the garment's proportions and armhole depth.
Step five · 5 minutes
Shorten sleeves without removing cuffs
Try on the shirt or jacket and mark where the sleeve should end—typically at your wrist bone when arms hang naturally. Measure from the cuff to your mark. Fold the sleeve inside-out and mark a line parallel to the cuff at that measurement. Using a slip stitch (same technique as hemming), fold the fabric along your marked line and stitch it closed. This creates a hidden seam inside the cuff. Try it on to confirm the length. If it's correct, trim excess fabric to half an inch and finish the raw edge.
Shortening sleeves is easier than hemming pants because you're working with a smaller circumference. Start here if you're nervous.
Step six · 2 minutes
Secure loose buttons before they disappear
Thread your needle and bring it up through one hole of the button from the underside of the fabric. Push the needle down through the opposite hole, then back up through the first hole. Repeat this cross-stitch pattern four to six times. On the final pass, bring the needle up under the button but don't go through the hole. Wrap the thread around the thread shank (the threads between button and fabric) two or three times to create tension. Push the needle to the back of the fabric and tie off with a small knot. This reinforced button will last months longer than a loose one.
A toothpick placed under the button while stitching creates the perfect amount of space for the thread shank.
How to know it works
A successful alteration should be invisible from the outside, feel comfortable when worn, and hold up through multiple washes and wears. Your stitches should be small, even, and hidden inside seams or folds. The garment should fit your body without pulling, bunching, or restricting movement.
Questions at the mirror.
My thread keeps knotting and tangling as I sew.
Your thread is too long. Cut it to arm's length (about 18 inches) and thread it fresh if it starts knotting. Longer thread has more opportunity to twist on itself. Also check that you're not pulling too hard—let the needle do the work.
I can see my stitches from the outside and they look messy.
Your stitches are too large or your needle isn't going deep enough into the fold. For slip stitches, the needle should barely catch a thread or two of the garment body. Practice on scrap fabric first to build muscle memory for the right depth.
The hem is wavy or uneven after I finished.
You likely didn't press the fold firmly before stitching. Heat sets the crease and prevents shifting. Iron the hem flat before you start, and press again after every few inches of stitching.
I took in the side seams but now the armholes feel tight.
You took in too much fabric at once. Side seams should taper gradually from the armpit to the hem, not be taken in equally all the way down. Next time, take in more at the waist and less near the armpit.