How To · Fashion · Alterations and Tailoring
How to Measure Yourself for Alterations
A tailor is only as good as your measurements. Here's how to take them accurately so your alterations fit like they were made for you.
5 min read · IrisBad measurements are the reason alterations disappoint. You show up to pick up your hemmed trousers only to find them an inch too short, or your taken-in blazer suddenly pulls at the shoulders. The problem isn't your tailor—it's the gap between what you said and what you actually need.
Before you hand over a single garment, you need to know how to measure yourself. Not with a rigid ruler or your phone camera. A soft measuring tape, proper posture, and these five steps will give your tailor the roadmap they need to make your clothes fit like they were tailored in a Milan atelier.
A tailor works from your measurements like a architect works from blueprints. Imprecise input guarantees imprecise output.
What you'll need.
- 01Soft measuring tape (fabric, not metal)
- 02Fitted tank top or t-shirt
- 03Mirror (optional but helpful)
- 04Notebook or phone for recording measurements
- 05A second person (optional, helpful for back measurements)
Step one · 1 minute
Gather your tools and wear the right base layer
You need a soft measuring tape (fabric, not metal), a mirror if possible, and ideally a second person to help. Wear a fitted tank top or t-shirt and the undergarments you'll wear with the finished garment—this matters for dresses and fitted pieces. Stand barefoot on a flat surface. Avoid measuring over thick sweaters or baggy clothing; the tape will lie to you.
If you're measuring alone, use your phone's voice memo to record each measurement immediately so you don't forget.
Step two · 2 minutes
Find your key reference points
Locate your shoulder seam (where your shoulder meets your arm), your natural waist (the narrowest part), your hip bone, and your collarbone. These are your anchors. Place two fingers horizontally at each point so you can return to it consistently. For sleeve length, find your wrist bone. For inseam, locate your inner thigh where your leg meets your body. Mark these spots lightly with a pen if it helps.
Your natural waist is not where your jeans sit. It's where you naturally bend when you reach your arms overhead.
Step three · 2 minutes
Measure bust, waist, and hip
Wrap the tape snugly (not tight) around the fullest part of your bust, keeping it parallel to the ground. Write this down. Repeat at your natural waist, then at the fullest part of your hip, about 8 inches below your waist. Keep the tape level each time—a sagging tape will add half an inch you don't actually have. Take each measurement twice to confirm accuracy.
The tape should feel like a gentle hug, not a corset. You should be able to slip one finger underneath.
Step four · 2 minutes
Measure sleeves, length, and rise
For sleeve length on a jacket or shirt, measure from the center back neck, across your shoulder, down your arm to your wrist bone. For pants inseam, measure from your inner thigh to your ankle bone (or where you want the hem to hit). For rise, measure from your waist down to your crotch seam. For dress length, measure from your shoulder bone straight down to where you want the hem. Always measure the side of the body, not the front or back, for the most accurate length.
If measuring inseam alone, wear the shoes you'll actually wear with the pants. Heel height changes everything.
Step five · 2 minutes
Measure shoulder width and neckline
Measure straight across your back from shoulder seam to shoulder seam. For neckline circumference, wrap the tape gently around the base of your neck where a collar would sit. These measurements matter for blazers, dresses, and anything that needs to sit right at your frame. Write down the exact spot where you measured—some tailors prefer measurements taken at specific points on the body.
Keep a photo of your measurement chart on your phone and text it to your tailor before your appointment. This prevents transcription errors.
How to know your measurements are right
Good measurements feel obvious when you compare them to a well-fitting garment you already own. Lay that garment flat, measure it the same way you measured yourself, and your numbers should align. If your bust measurement is 36 inches and your favorite shirt measures 38 inches across the chest, you've got your baseline. Bring this reference garment to your tailor appointment.
Questions at the mirror.
Should I measure myself or have someone else do it?
A second person is ideal for back measurements and sleeve length, but you can absolutely measure yourself accurately if you're methodical. The key is using a mirror, taking measurements twice, and staying still. If you're paying for alterations, spend five extra minutes getting this right.
What if my measurements seem off compared to my usual size?
Sizes are meaningless. A size 8 at one brand is a size 10 at another. Measurements are the truth. If your bust measures 36 inches, that's your bust measurement regardless of what the label says. This is actually liberating—you're no longer chasing a number, you're chasing fit.
Do I need to measure every part of my body for every alteration?
No. For a simple hem, you only need length. For a blazer taken in, you need bust, waist, shoulder width, and sleeve length. Ask your tailor which measurements matter for your specific alteration before you measure everything.
How precise do my measurements need to be?
Within a quarter inch is professional-grade. Most home measurements accurate to half an inch are fine. The real precision comes from communicating *how* you want it to fit—snug or relaxed, cropped or full length—not from measuring to the millimeter.