Advance pattern dating
The final sloper pattern is usually made of cardboard or paperboard, without seam allowances or style details (thicker paper or cardboard allows repeated tracing and pattern development from the original sloper).
Once the shape of the sloper has been refined by making a series of mock-up garments called toiles (UK) or muslins (US), the final sloper can be used in turn to create patterns for many styles of garments with varying necklines, sleeves, dart placements, and so on.
In sewing and fashion design, a pattern is the template from which the parts of a garment are traced onto fabric before being cut out and assembled.
Patterns are usually made of paper, and are sometimes made of sturdier materials like paperboard or cardboard if they need to be more robust to withstand repeated use.
The process of changing the size of a finished pattern is called grading.
Several companies specialize in, usually employing at least one specialized patternmaker.
Usually, flat patterning begins with the creation of a sloper or block pattern, a simple, fitted garment made to the wearer's measurements.
For women, this will usually be a jewel-neck bodice and narrow skirt, and for men an upper sloper and a pants sloper.