What Is a Bodice Block and How Do You Make One?
If you have ever tried to make a garment from a commercial sewing pattern and found the fit frustrating, the bodice block is what you have been missing. It is the tool that professional pattern makers use before a single centimetre of fabric is cut, and learning to make one is one of the most practical steps a sewer can take.
What is a bodice block?
A bodice block is a basic fitted template that covers the torso from the shoulder to the waist. Unlike a commercial pattern, it has no style details and no seam allowance. It is not designed to make a finished garment directly. Instead, it is a master template, drafted to your specific body measurements, from which any number of different garment designs can be developed.
Think of it as a foundation. Once a well-fitted bodice block exists, a pattern maker can slash, rotate, and manipulate it to create a fitted dress, a shirt, a jacket, or a corset. Without one, every new pattern has to be fitted and adjusted from scratch. With one, the fitting work is largely already done.
What does a bodice block include?
A standard fitted bodice block includes a front bodice piece and a back bodice piece, with a waist dart and a bust dart on the front. These darts are what allow the flat paper pattern to conform to a three-dimensional body. The block also establishes the shoulder line, armhole curve, side seams, and neckline, all of which are drawn to match the individual's measurements rather than a standardised size chart.
In industry, bodice blocks are also called slopers or basic blocks. The terminology varies by country and context but the function is the same: a clean, fitted starting point from which design work begins.
How is a bodice block made?
Drafting a bodice block involves taking a series of body measurements, including bust, waist, back length, shoulder width, and bust apex position, and using those measurements to draw the pattern to scale on paper. Each measurement informs a specific part of the pattern: the bust measurement dictates how wide the front piece is drawn, the back length sets the vertical drop from shoulder to waist, and the bust apex position determines where the dart points.
The process is methodical rather than intuitive. Once the measurements are applied, curves are drawn at the armhole and neckline using flexible rulers, and the dart is calculated to draw the excess fabric into the shaping. A toile, a test garment made in inexpensive cotton, is usually sewn up from the block to check the fit before any design work begins.
Why learn to make one rather than buying a block?
Pre-made blocks are available in standard sizes, and they are useful as a starting point. But a block that is drafted from your own measurements, or the measurements of a client, will fit with far greater accuracy. For anyone who sews for themselves, this means no more adjustments at the bust or the shoulder. For fashion students and industry professionals, it means patterns that are ready to develop rather than patterns that require correction before design work can begin.
The skill of drafting a block from scratch is also transferable. Once the logic of the bodice block is understood, drafting a trouser block or a sleeve block follows similar principles.
Where to learn bodice block making in Melbourne
The Pattern Making Class runs a one-day Bodice Block workshop at its studio in North Melbourne, open to beginners and those with some sewing experience. The workshop covers taking and applying measurements, drafting the front and back bodice, working with darts, and producing a completed block to take home. The class is taught by working industry pattern makers, and class sizes are kept small.
View upcoming dates and book a place at The Pattern Making Class bodice block workshop.