New Split Sizing

Moving forward, our patterns will include two different size ranges. This means that you can choose a pattern in sizes 0-16 (XS-L) or 18-26 (XL-XXXL) and print only that size range.

Sizes 0-16 are drafted for a C cup and sizes 18-26 are drafted for a DD cup.

Digital patterns will include both layouts. If you purchase a printed pattern from our shop, you will also be able to download a digital version so that you can print the sizes you need.

These changes are in effect for January’s Seamwork patterns and for all Colette designs moving forward.

To read more about these changes, click the link below.

Why are these changes being made?

We are making these changes for several reasons.

  • Readability: Our patterns have a very inclusive size range. Layouts that include all 12 sizes can be very difficult to read and to cut. Having fewer sizes on each layout means we are able to include more markings and information without the pattern becoming unreadable.
  • Our patterns are designed to include different body types: Larger sizes are designed for a curvy body type with larger cup size and hips, among other differences Smaller sizes are designed for a somewhat less curvy body type. Both these body types are based on anthropometric data in order to create the best fit at any size. For the last couple years, we have stacked these different types together onto one layout. We’ve found that stacking them together this way makes patterns more confusing and harder to read and understand, as lines can crisscross, especially around curves.
  • We can customize the fit: Separate versions for each size range allows us to include small feature changes to the patterns and instructions that are best suited for each size range. For example, one design might fit better on a larger cup size if it has a dart added. With separate layouts and separate instructions, we can make this tweak to provide a better fit, including modified instructions.

  • To save paper! This will allow for many people to save a considerable amount of paper when printing and reduce waste overall.

Why can’t the size ranges be drafted the same?

The process of drafting both size ranges is exactly the same, but each size range is created from a different starting point, depending on the body type it’s created for. If we were to use only one body type, the fit for many people would suffer. This is why we have a separate block for each size range, a separate fit model, and a separate fit process: so that both size ranges get the look that best suits them.

How do I blend between the size ranges?

If you find that you are between the two size ranges, we recommend beginning with the size that most matches your body shape. For dresses and tops, choose the size that matches your bust measurements and cup size. For skirts and trousers, choose the size that matches your waist-to-hip ratio.


To blend between the size ranges, cut along the cutting line of each size you will be blending. Align the two pattern pieces either at the waist, end of armhole, or center front/back, with the smaller pattern piece on top of the larger pattern piece. Tape in place. With a curved ruler, trace the base pattern and blend to the other size. For more help with blending sizes, click here.

If I am between size ranges, do I size up or down?

Again, choose the size that best matches your body shape, based on your measurements and cup size. From this point, you can add or subtract ease to the pattern where needed.

If I need both size ranges, do I have to print two patterns or buy two patterns?

If you purchase a printed pattern from our shop, you can also download a digital pattern which includes all sizes. This allows you to print any sizes that you do not have in your printed copy.

Digital patterns include both sets of sizes. If you’d like both size sets, you will need to print both. We also include a wide-format copy shop version of each for your convenience.

Will this change be made to past designs?

We may change some past designs as we print new editions. We believe it will make all our patterns easier to read and to use.