A Tech-pack is a technical description manual of a garment design for clothing manufactures. They need a tech-pack to make a prototype of the design. These prototypes are also called 'Samples' or 'Salesman samples.' Tech-packs are created by fashion designers, technical designers, and product developers.
Components in a Tech-pack
Clothing manufacturing is a long and elaborate process in which many components have to be created, such as; fabrics, prints, patterns, buttons, zippers, cords, labels, etc. All these elements and details have to be explained in a Tech-pack to get an accurate sample.
Size spec chart
A design is also called a 'Style.' The purpose of a 'Stylesheet' is to explain a design's look and feel. On this page, I'll put a full-colour drawing including the intended Pantone colours and codes. I use Pantone's Textile Colour System, predominately. At the left top of the frame, I'll put the intended collection season and the design's name. At the right top of the frame, I'll put the colourway of the design. In the column at the right, I'll put the information about the components I want to use in the designs, such as; fabrics, trims, artwork, labels, etc. These components are also called BOM (Bill of Material).
Description sheet Drawings can be interpreted in different ways. Therefore a ‘Description sheet’ is essential in a tech-pack. In a ‘Description sheet,’ all components of a design should are explained, as well the drawing techniques should be clarified - for example, a dotted line. If fashion designers want to illustrate stitching, they often use dotted lines. But a dotted line in a drawing could also mean something else entirely - for example, a dotted print. Therefore, an accurate and detailed ‘Description sheet’ is essential in creating a decent salesman sample.
Size spec chart A Size spec is a measurement chart created for pattern cutters/pattern makers. Pattern cutters will make a pattern based on the measurements listed in a Size Spec. These patterns are used to make a sample.
In a Size Spec, all measurements such as the front length, chest width, and shoulder-length of a garment must be stated. I'll always put a small black and white drawing on the left side of the page to make it more visual for the pattern cutter and, I'll point out more elaborated details and measurements with red arrows.
The regular measurements, such as the chest width, I'll just put in the right column. At the right top of the frame, I'll put the sample size. I'll always include a guidelines sheet of how I measured in my Tech-packs to avoid confusion. This guidelines sheet is also called 'POM sheet' or 'POM's sheet' (Points of Measurement).
You must have a good understanding of pattern cutting and clothing construction to create a precise Size Spec. I studied pattern cutting and clothing making for over six years in The Netherlands and, I've worked for a tailor.