In the first part of my series on sewing pants, I cover essential measurements.

Hey, friends. Let’s have a heart-to-heart convo, right here, right now. Does sewing pants freak you out? Yes? Me, too.

That’s why I went to pants school at the Original Sewing and Quilt Expo. The class was Achieving Perfectly Fitting Pants: A Lesson in Three Parts. Dudes, it was I-N-T-E-N-S-E. Three two-and-half-hour sessions in two days. I learned so much.

So much, in fact, I can’t cover it in one blog post. This post, Part 1, will cover essential measurements. Part 2 will cover how to adjust your paper pattern pieces based on the essential measurements. And I think I’ll wrap up this odyssey of sewing pants with Part 3: These Here are the Pants I Done Sewed Using This Technique.

Ready to ride with me? Giddy up!

About the Pants Class

The class was taught by taught by sewing educator and pattern designer Cynthia Guffey. She’s a self-taught sewist, a fast-talking Southern lady, and a genuine hoot.

According to Guffey, “Everyone has a cute butt, you just need to fit it.” This is why we care about fitting pants correctly! Cute butts forever.

Guffey has developed this pants-fitting technique over decades, and she’s constantly on the road teaching it to eager sewists. My recap of her technique hits the most-critical elements. If you need more info, you can buy the following materials on sewing pants from Guffey (I received them as part of the class, and I think they’re worth it!):

If you can swing a class with her, do it. Being able to ask questions and watch her work is priceless.

Sewing Pants Starts with Measurements!

Before you can start sewing pants, you have to take measurements.

Many, many measurements.

The best way to manage your measurements is to make a table. This will make paper pattern changes A LOT easier! A table will help you stay better organized than a collection of chicken-scratch measurements all over the place (ask me how I know)!

Your table will have four columns:

  • Measurement
  • My Body
  • The Pattern
  • Difference (+/-)

Under the Measurement column, write the following:

  • Left Side to Floor
  • Right Side to Floor
  • Center Front to Floor
  • Center Back to Floor
  • Front Waist Width
  • Back Waist Width
  • Finished Front Hip at 2″
  • Finished Front Hip at 4″
  • Finished Front Hip at 6″
  • Finished Front Hip at 8″
  • Largest Hip Point in Front
  • Finished Back Hip at 2″
  • Finished Back Hip at 4″
  • Finished Back Hip at 6″
  • Finished Back Hip at 8″
  • Largest Hip Point in Back
  • Waist to Knee
  • Crotch Length (+ 1 – 1.5″)
  • Crotch Depth (Sitting)
  • Finished Pants Length

If one hip is higher than the other, you will have additional rows (keep reading for more info).

Let’s Get Started Sewing Pants!

Maybe all my headers in this post will have exclamation points! Pants!

After you make your table, next thing is to tie a quarter-inch piece of elastic around your waist where you want your pants waistband to sit. NOTE: This elastic DOES NOT go at your natural waist (unless you want to wear pants at your natural waist, then by all means, do your thing)! The elastic is your key reference point for making adjustments to the paper pattern.

Slip into some leggings and kick off your shoes. Here’s what you and your best measuring buddy need to know about all those aforementioned measurements to be recorded:

Here are critical measurements to take when sewing pants, according to sewing educator Cynthia Guffey.

(A) Left Side to Floor, Right Side to Floor

In my diagram, I only labeled one side, but you get the picture. Measure from the waist to the floor on the left and right sides. This will determine if one hip is higher than the other. If one hip IS higher, skip down in this post for special directions!

(B) Center Front to Floor, Center Back to Floor

Measure from waist to floor in the front and back.

Front Waist Width

Measure the front of the waist, at the elastic.

Back Waist Width

Measure the back of the waist, at the elastic.

Finished Front Hip at 2″, 4″, 6″, 8″

Cut four strips of masking tape, each about 12 inches. On each strip, mark off 2 inches, 4 inches, 6 inches, and 8 inches. Stick the masking tape vertically on the side of each leg and on the center front and center back, all starting from the waist.

Measure across the front hip at each increment, using the masking tape as a guide.

Largest Hip Point in Front

Locate the largest point of the hip, and mark it on a strip of masking tape. Measure the distance from the waist to the mark and write it down. Mark the largest hip point on the other pieces of tape using this measurement. (I didn’t mark this measurement on the diagram to keep the it from becoming cluttered.)

Measure across the front hip at the largest point.

Finished Back Hip at 2″, 4″, 6″, 8″

Measure across the back hip at each increment, using the masking tape as a guide.

Largest Hip Point in Back

Measure across the back hip at the largest part.

(C) Waist to Knee

Measure from the waist to the knee.

(D) Crotch Length (+ 1 – 1.5″)

Measure from the front waist to the back waist, between the legs. The measuring tape should rest against the body without ease. Add 1 inch to 1.5 inches of ease to the measurement and record it in your handy-dandy table!

(E) Crotch Depth (Sitting)

Sit down (no, really — this measurement MUST be taken sitting down). Measure from the waist at the side of the hip to where the bum hits the table or chair.

(F) Finished Pants Length

Measure from the waist to the desired hem. If you’re fixing to wear this pants with a particular pair of shoes, now is a good time to slip them on.

Crotch Curve

The crotch curve is the shape of your hips. It’s a shape, not a measurement. Use a flexible ruler (affiliate link) to capture the shape of your curve.

Place the top of the ruler at the center back waist. Run the ruler over the back hip and just between the legs, shaping it to mimic your body shape. Take the ruler away from the body and trace the crotch curve on paper.

Guffey explained that most pants patterns are designed for women with a rounder crotch curve, not a flat curve. This is why many sewists end up with bagginess under the bum. Just for fun, here’s my crotch curve, as captured by Guffey:

Here's my crotch curves, traced by my teaching in a class on sewing pants.

What If Your Hips are Uneven?

If you take the left- and right-side-to-floor measurements and find that your hips are uneven, you have a little more work to do. And, speaking of uneven hips, you’re not a broken person if you have uneven hips. A number of the sewists in my pants class were uneven; it’s normal, and no body is perfectly symmetrical.

You will need to split your measurements into two hemispheres. All horizontal measurements will have right and left components:

  • Front waist (right front waist, left front waist… you get the idea)
  • Back waist
  • Front hip
  • Back hip

For the vertical measurements, measure them on your lower side.

Ultimately, if you have uneven hips, you will create separate pattern pieces for your legs/hips to maximum customization.

I will be back with Part 2 in two weeks (I’m taking a little holiday next week, so no post). Stay tuned! In the meantime, please ask any questions in the comments and I’ll do my best to answer them. I AM NOT a pants-fitting experts; I’m merely relaying what I learned from this pants-fitting intensive.

P.S. Here’s my post from last week: How to Choose Fabric: A Crash Course in Fashion Textiles. ICYMI, it’s about another course I took at the sewing expo.

P.P.S. Here are the links to the two other parts of this three-part series. And yes, for maximum understanding, you should read them in order:

Sewing Pants, Part 2: Altering Pants Pattern Pieces

Sewing Pants, Part 3: A Completed Pair of Hampshire Trousers