How to Take Body Measurements for Sewing Patterns

The single most common reason a home-sewn garment doesn’t fit is wrong measurements. Either the sewer didn’t measure carefully, or they measured once years ago and assumed nothing had changed, or they cut by ready-to-wear size instead of the pattern’s own chart. Each of these produces the same outcome: a garment that’s too tight, too loose, or oddly proportioned in places.

Body measurements are the foundation of everything else in sewing. Get these right, and pattern selection becomes mechanical. Get them wrong, and the rest of the process is built on sand.

This guide covers exactly what to measure, how to measure it, and how to apply those numbers to pattern selection.

Tools you need

• A flexible cloth tape measure — not a metal carpenter’s tape. The cloth tape conforms to body curves; metal doesn’t.
• A second person, or a mirror with side angles — many measurements are hard to take accurately on yourself. A friend, spouse, or sewing buddy improves accuracy dramatically.
• A ribbon or piece of string — tied around your natural waist before measuring. The ribbon stays in place and gives you a consistent reference point for waist-related measurements.
• A note-taking method — paper and pencil, phone, or a sewing notebook. Record the date along with the numbers.

What to wear when measuring

Wear your usual undergarments and lightweight, fitted clothing. A tank top and leggings is fine. Avoid:

• Bulky sweaters or layered clothing — they add inches.
• Spanx or shapewear — they distort proportions.
• Loose flowy tops — they hide your actual shape.

If you’re sewing a specific bra-and-shaping situation (e.g., a formal dress with a strapless bra), wear that bra type when measuring. Bra cup affects bust position and shape significantly.

The 13 essential measurements

Here are the measurements every sewing pattern uses. Take all of them once, write them down, and update annually.

1. Bust

The fullest part of the chest, with the tape parallel to the floor. Don’t squash the bust; the tape sits gently on top.

2. Underbust

Around the body directly under the bust, where a bra band sits. Used for FBA calculations and fit adjustments. See our full bust adjustment guide.

3. High bust

Around the body above the bust, under the arms, with the tape going across the chest above the bust apex. Often used to choose a pattern size when bust measurement vs cup size suggests an FBA is needed.

4. Waist (natural)

The narrowest point of the torso, usually about 2.5 cm above the navel. This is where you tie your reference ribbon. Don’t suck in.

5. Hip (full)

The fullest part of the hips and bum, typically 18–22 cm below the natural waist. Tape parallel to the floor.

6. Upper hip

About 10 cm below the natural waist, around the high hip / hip bone. Important for skirt and trouser fit at the waistband.

7. Back length

From the prominent bone at the base of the neck down the spine to the natural waist (where your reference ribbon sits). Used for adjusting bodice length.

8. Front length

From the centre of the shoulder line down across the bust to the natural waist. Important for FBAs.

9. Shoulder width

Across the back, from the bony tip of one shoulder to the other. Tape stays at shoulder height.

10. Sleeve length

From the bony tip of the shoulder, down the outside of the arm, to the wrist. Bend the elbow slightly while measuring; a fully straight arm gives a too-short measurement.

11. Bicep

Around the fullest part of the upper arm.

12. Wrist

Around the wrist where a watch sits.

13. Inseam

From the crotch down the inside of the leg to the floor (or to wherever your pants typically hem). For trousers, this is the most important leg measurement.

Optional: thigh, knee, calf, ankle

Useful for fitted trousers and dresses with detailed leg shaping. Not every project needs them.

How to measure each correctly

A few principles that apply across measurements:

• Tape parallel to the floor for circumferences (bust, waist, hip, etc.). Tilted tapes give wrong numbers.
• Tape snug, not tight. A tape pulled hard distorts the body and gives a too-small measurement.
• One finger of slack. A common rule: the tape should fit so you could slip one finger underneath. Tight enough to stay in place; loose enough not to compress the body.
• Measure twice, average if needed. If two measurements of the same place differ by more than 1 cm, take a third and use the median.
• Don’t measure right after eating, exercise, or first thing in the morning. Bodies change throughout the day; afternoon is the most consistent baseline.

Common measurement mistakes

”I measured years ago”

Bodies change. Weight, age, exercise, pregnancy, and other factors all shift measurements. Re-measure annually, or before any significant project.

”I’m a size 10 in stores so I’ll cut size 10”

RTW sizing has no relationship to pattern sizing. A “size 10” in a department store could be a size 14 in a Big Four pattern. Always use the pattern’s own size chart, based on your actual measurements. Our Big Four vs indie patterns guide covers this in more detail.

”I added the seam allowance before measuring”

The pattern’s size chart is body measurements, not finished garment measurements. Don’t add ease, allowance, or any padding to your numbers. The pattern designer has built ease into the pattern; your job is to match your body measurements to the chart, and the pattern handles the rest.

”I held the tape really tight”

Compressing the body gives a smaller measurement, which leads to too-small garments. Snug, not tight.

”I measured myself in the mirror”

Some measurements (back length, shoulder width, sleeve length on a bent arm) are hard to take accurately on yourself. If you can find someone to help, your numbers will be more reliable.

Using measurements to choose a pattern size

Most patterns provide a size chart with bust, waist, and hip measurements. Compare your three numbers to the chart:

Scenario 1: All three measurements match one size

The simplest case. Cut that size.

Scenario 2: Different measurements match different sizes

Common — most bodies aren’t the proportions of a pattern’s “standard.” For example, you might be a 10 bust, 12 waist, 14 hip. The standard approach: choose the size based on the measurement that’s hardest to alter, then grade between sizes for the others.

For tops and dresses, choose by bust (or high bust if you’re full-busted — see FBA notes). For skirts and trousers, choose by hip. For one-piece garments like dresses, you may grade between sizes from waist up vs waist down.

Scenario 3: Your measurements don’t match any size in the chart

Some patterns size from a 0 to a 16; others go to a 26. If you’re at the edge of the size range, look for a different pattern company that includes your measurements. Indie pattern brands increasingly publish extended size ranges.

Scenario 4: Cup size is bigger than the pattern’s draft

Most patterns are drafted for a B cup. If you wear a C cup or larger, the pattern’s bust measurement might suggest a larger size than your body actually fits — but cutting that larger size makes the rest of the garment too big. The fix is to cut your high-bust size and add an FBA. See our full bust adjustment guide.

Recording your measurements

Keep a permanent record. A simple template:

Date: _______________
Bust:           ___ cm / ___ in
High bust:      ___ cm / ___ in
Underbust:      ___ cm / ___ in
Waist:          ___ cm / ___ in
Upper hip:      ___ cm / ___ in
Hip (full):     ___ cm / ___ in
Back length:    ___ cm / ___ in
Front length:   ___ cm / ___ in
Shoulder width: ___ cm / ___ in
Sleeve length:  ___ cm / ___ in
Bicep:          ___ cm / ___ in
Wrist:          ___ cm / ___ in
Inseam:         ___ cm / ___ in

Update the date when you re-measure. Keep old versions; the trend over time is interesting and sometimes useful for fitting older patterns.

Some sewers record measurements in their phone notes or in a dedicated sewing notebook. Whatever you’ll actually keep updated.

Adjustments for ease

Patterns include “ease” — the difference between your body measurement and the finished garment. Two types:

• Wearing ease: minimum extra fabric to allow movement. Roughly 5 cm at the bust for a fitted woven garment, 0 for a knit garment, 8–15 cm for a loose woven garment.
• Design ease: extra fabric added by the designer for style — a flowy top might have 25 cm ease at the bust; a fitted dress might have only 5 cm.

The ease is built into the pattern. You don’t add it. If a pattern’s finished bust measurement is 100 cm, that’s 100 cm of fabric — designed for a body smaller than 100 cm by however much ease the designer chose.

Some sewers prefer to check the finished garment measurements (often printed on the pattern pieces themselves) and decide based on the finished number rather than the body chart. This is especially useful for fitted garments where you want a specific tightness.

When to remeasure

• Before any major project, especially fitted garments.
• Annually, regardless of whether your weight has changed.
• After any significant body change (pregnancy, weight gain or loss, intensive exercise, hormonal changes that affect body composition).
• Before fitting a muslin for a new pattern. See our muslin guide.

A 1 cm change is rarely meaningful for fit; a 3 cm change can completely change which size you cut.

Closing thought

Body measurements feel tedious — taking thirteen measurements before starting a project is the kind of preparation home sewers often skip in favour of getting straight to cutting. But the time saved by skipping measurement is paid back many times over in fixing fit problems later. Or worse: in finished garments that hang in the wardrobe unworn because they never quite fit.

Twenty minutes once a year with a tape measure is the foundation of everything that follows. Worth doing right.

For where measurements fit into the broader pattern process, see our understanding sewing patterns guide.