In sewing and fashion design, a pattern is the template from which the parts of a garment are traced onto woven or knitted 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 making or cutting patterns is sometimes referred to as patternmaking, but it can also be written as pattern making or pattern cutting.
A sloper pattern, also called a block pattern, is a custom-fitted, basic pattern from which patterns for many different styles can be developed. The process of changing the size of a finished pattern is called pattern grading. Several companies, like Butterick and Simplicity, specialize in selling pre-graded patterns directly to consumers. These patterns are usually printed on tissue paper and include multiple sizes that overlap each other. An illustrated instruction sheet for use and assembly of the item is usually included. The pattern may include multiple style options in one package. Clothing brands make their patterns with in-house patternmakers, third-party specialists, or (often when manufacturing in overseas factories) will rely on the factory’s in-house patternmakers. While commercial production patterns are engineered to fit several standard average body sizes, in bespoke clothing, patterns must be adjusted or developed for each individual client.
Pattern making A patternmaker typically employs one of two methods to create a pattern. The flat-pattern method is where the entire pattern is drafted on a flat surface from measurements, using rulers, curves, and straight-edges. A pattern maker would also use various tools such as a notcher, drill, and awl to mark the pattern. 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. 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) or Nessel in German, the final sloper can be used to create patterns for many styles of garments with varying necklines, sleeves, dart placements, and so on. The flat pattern drafting method is the most commonly used method in menswear; menswear rarely involves draping. The draping method involves creating a mock-up pattern made of a strong fabric (such as calico) in a linen weave. The fabric is far coarser than muslin, but less coarse and thick than canvas or denim. However, it is still very cheap, owing to its unfinished and undyed appearance. Then, by pinning this fabric directly on a form, the fabric outline and markings will be then transferred onto a paper pattern, or the fabric itself will be used as the pattern. Designers drafting a sculpted evening gown or dress which uses a lot of fabric--typically cut on the bias--will use the draping technique, as it is very difficult to achieve this with a flat pattern. This method is also used for collars. Each pattern manufacturer has their own size ranges. A distinction is made between a basic pattern, a first pattern, and a production pattern. Patternmakers grade the first cuts to the desired size with the aid of CAD software (computer-aided design). The production pattern must contain all the information necessary for production and all the necessary parts. The collections are produced in sets of sizes. The customer has the garment altered by a tailor after purchase, if necessary.
Pattern digitizing After a paper/fabric pattern is completed, very often patternmakers digitize their patterns for archiving and vendor communication purposes. The previous standard for digitizing was the digitizing tablet. Nowadays, automatic options such as scanners and camera systems are available.
Fitting patterns Mass market patterns are made standardized, so store-bought patterns fit most people well. Experienced dressmakers can adjust standard patterns to better fit any body shape. A sewer may choose a standard size (usually from the wearer's bust measurement) that has been pre-graded on a purchased pattern. They may decide to tailor or adjust a pattern to improve the fit or style for the garment wearer by using French curves, hip curves, and cutting or folding on straight edges. There are alternate methods of adjusting a pattern, either directly on flat pattern pieces from the wearer's measurements, using a pre-draped personalized sloper, or using draping methods on a dress form with inexpensive fabrics like muslin. Some dress forms are adjustable to match the wearer's unique measurements, and the muslin is fit around the form accordingly. By taking it in or letting it out, a smaller or larger fit can be made from the original pattern. Creating a sample from canvas is another method of making patterns. Canvas fabric is inexpensive, not elastic and made from Urticaceae. It is easy to work with when making quick adjustments, by pinning the fabric around the wearer or a dress form. The sewer cuts the pieces using the same method that they will use for the actual garment, according to a pattern. The pieces are then fit together and darts and other adjustments are made. This provides the sewer with measurements to use as a guideline for marking the patterns and cutting the fabric for the finished garment.
Pattern grading Pattern grading is the process of shrinking or enlarging a finished pattern to accommodate it to people of different sizes. Grading rules determine how patterns increase or decrease to create different sizes. Fabric type also influences pattern grading standards. The cost of pattern grading is incomplete without considering marker making.
Parametric pattern drafting Parametric pattern drafting implies using a program algorithm to draft patterns for every individual size from scratch, using size measurements, variables and geometric objects. There is number of pattern drawing plugins for the popular parametric CAD software (e.g. for AutoCAD), as well as specialized pattern design software with parametric drawing support (e.g. Valentina).
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