About KATAPATA
KATAPATA is a browser-based tool for creating custom sewing slopers from your own body measurements. Basic bodice and sleeve slopers are free, while dart-transfer, skirt, and pants slopers can be previewed first and purchased individually when needed.
Paid sloper purchase and printable PDF export are now availableA simpler starting point for custom patternmaking
Create a custom basic sloper
Enter bust, waist, back length, sleeve length, and other measurements to generate front and back bodice slopers and a sleeve sloper.
You can then fine-tune key points on screen before saving your working data or exporting a printable PDF.
A foundation for your own patterns
A sloper, also called a basic block, is a close-fitting foundation used to develop garment patterns.
KATAPATA helps you create that starting shape. It does not automatically turn the sloper into a finished blouse, dress, skirt, or pants pattern.
From measurement entry to printable PDF
Create custom slopers
Generate basic bodice and sleeve slopers using your own measurements.
Fine-tune the shape
Move adjustment points to refine shoulders, armholes, sleeve cap, and other areas.
Save working data
Save your KATAPATA data and reload it later or on another supported device.
Export printable files
Export full-size, A4 tiled, or US Letter tiled PDFs.
Use dart transfer options
Create, adjust, and preview front and back dart-transfer slopers, then purchase only the one you want to export.
Create skirt and pants slopers
Create, adjust, and preview custom skirt and pants slopers, then purchase only the one you need.
Basic bodice and sleeve slopers are free
Start with the free sloper workflow, then purchase only the additional sloper you want to export.
Purchase only what you need
Dart-transfer and bottom slopers are sold individually. You can create, adjust, and preview each paid sloper before purchase.
Transfer Sloper ¥400
Transfer Sloper ¥400
- Each purchase applies to one finalized and saved sloper data set.
- Purchased slopers can be exported again from the saved purchased data.
- Changing measurements or adjustments creates a different sloper data set.
- Payments are completed through Stripe Checkout.
- No KATAPATA account or subscription is required.
What KATAPATA creates—and what it does not
A sewing sloper / basic block
A close-fitting foundation pattern based on your measurements.
- Basic bodice sloper
- Sleeve sloper
- Front and back dart-transfer slopers
- Skirt and pants slopers
A finished garment pattern
To make a garment, the sloper must be developed for the chosen design.
- Add design ease
- Change necklines and silhouettes
- Add collars, facings, plackets, or pockets
- Add seam allowances and construction details
Works in a browser, with PC recommended
Smartphone and tablet
Measurement entry and basic operation are available on supported mobile devices. The interface is designed to remain usable on smaller screens.
PC recommended
A larger screen makes it easier to view the full sloper, compare pieces, and perform detailed adjustments.
Continue exploring KATAPATA
Create your custom basic sloper.
Basic front and back bodice slopers and the sleeve sloper are free. You can also create and preview paid slopers before deciding whether to purchase them.
Open the Sloper Tool