How To Grade Between Sizes In PDF Sewing Patterns

Welcome to the tenth lesson in the Beginner’s Guide to Sewing Knit Apparel! Download the ebook for free!

In our last lesson, we took our measurements and compared them to some sizing charts. Now, most sewing patterns are made for an ideal hourglass shaped woman. And as everyone on planet Earth knows, not all of us are shaped the same way! This is what makes sewing so awesome. You can sew your clothes to fit you and your wonderful shape perfectly.

If your measurements hover pretty closely to each other than I find that taking an average size works just fine. But if they happen to be a couple sizes away from each other on a sizing chart, grading is nothing for you to shy away from.

So let me give you an example. In the case that you don’t have an hourglass shape, you may find that some of your measurements were all over the sizing chart. For example say my measurements are: 32 bust, 27 waist and 37 hip. Let’s go ahead and see where these would fall in an example sizing chart below:

Bust 32-33 34-35 36-37 38-40 41-42
Waist 24.5 25-26 27-28 29-30 31-34
Hip 35-36 37-38 39-40 41-43 44-45

As you can see, this would put me in XS for the bust, M for the waist and S for the hip. In this scenario, I wouldn’t feel comfortable just cutting out one size. Instead, I would opt to grade between the three sizes.

With the measurements in my example, if I were to grade a pattern for a shirt, it might look something like this:

XS Bust, M Waist, S Hip Grading Path

Notice how I kept along the XS pattern size down the bust, moved out for the waist then pulled back in again for the hip. I would do this with both the front bodice and back bodice pieces. This would get me the best fitting garment for my measurements using this pattern.

Editor’s Note: Ready to use your newfound knowledge? Check out the Mae Poncho!

You can do this for single measurements too. Say your bust and waist both measure a S but your hip measures a L. In that scenario your grading path would look something like this:

S Bust, S Waist, L Hip Grading Path

Or let’s say you have an XL bust measurement, M waist and XL hip. Your grading path would look something like this:

XL Bust, M Waist, XL Hip Grading Path

In all cases, you are simply grading your cut path between the different sizes. Taking the time to do this if you’re measurements are further from each other, will make you a lot happier with the fit of your clothing when they are all sewn up. Most people will find themselves within the range of one or two sizes, but if you are one of the beautifully, unique women who don’t, size grading is for you.

Need more help? No problem! Watch the Facebook Live Grading class below:

Lesson assignment: No lesson assignment! Continue onto the next two lessons on properly printing your PDF sewing patterns. If grading is right for you, go ahead and grade your pattern pieces following the conclusion of the next two lessons.

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6 thoughts on “How To Grade Between Sizes In PDF Sewing Patterns”

  1. Hi,
    It is the first time I bought a DIBY pattern. It is also the first time I’m going to try to sew a shirt. I’m so suprised about the clearness and great tutorials you provide!
    Great work!
    Thank you,

  2. Hello,
    Very clear tutorials…thanks
    In grading, you do not touch the center front or thr center backs?

    I notice you did not touch those. Is it the norm or there are exceptions

    1. This is the norm. Unless you are doing a swayback adjustment, or another similar adjustment specific to the centerline, (and the back bodice has a center-back seam) you should only make grading adjustments on the side seams. 🙂

  3. Wow, I’m all over in the Size Chart. I’m excited try out my very first “grading”.
    Thank you so much for all of your clear and detailed explanations.

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