patroonblok

A patroonblok (Dutch; literally "pattern block") is a basic garment template used in fashion design and patternmaking as the foundation for creating finished clothing patterns. Also known by terms such as sloper or block pattern in English, a patroonblok represents a close-fitting, minimally styled version of a bodice, skirt, sleeve or trouser that reflects the exact measurements and proportions of a specific body type.

Purpose and use: Patroonblokken serve as starting points for design development and pattern alteration. They allow designers and patternmakers to test fit and proportion, translate style lines, and produce consistent sizing through grading. A fitted toile or muslin made from the block is commonly used to evaluate and refine fit before final pattern modifications.

Creation and materials: Blocks are drafted either by hand using body measurements and drafting rules or generated digitally with CAD patternmaking software. They are commonly made on paper or card, and can be adjusted repeatedly. The process typically includes measuring, drafting, constructing a toile, fitting and iterative adjustments until the block accurately represents the intended fit.

Variations: Typical blocks include bodice, skirt, sleeve and pant blocks and can be gender- or age-specific. Industry and bespoke ateliers maintain standard blocks for production consistency, while independent designers adapt blocks to create diverse styles.

Related concepts: Patroonblok relates to pattern drafting, grading, toile (fit prototype) and pattern manipulation techniques used throughout apparel design and garment production.