What is a Tech Pack?
A Tech Pack, which is their full name, is a blueprint, or set of instructions that you give to a factory. It contains a mixture of drawings, measurements and technical information, which tells a factory exactly what you want them to make and how exactly, you want your design to be sampled or manufactured into a piece of clothing.
A basic Tech Pack consists of 3 pages, but can also be extended to include a sampling sheet or depending on the additional techniques, processes and details you want to add to your design. So for example, if you are adding a print, you will also need to add pages to show the print artwork with instructions for the type of print. This would be the same for embroidery, labels, back neck tape and so on. So actually, your Tech Pack can be fairly big if you have a lot of things to explain.
Flat Drawing is a technical drawing of a garment that is done in a very specific way. The line weights mean different things and there are a lot of rules around how they have to be laid out and what you can and can’t do.
Measurements for your sample, are a little more complex than just copying charts off the web. This is basically adding the concrete measures that the garment requires. 
Spec Sheet, is the technical information. This refers to colours, fabric information, machinery, trims and any techniques you need for your clothing design.
Tech Pack Sample
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Tech Pack Sample

A little explanation of my own Tech Pack presentation.

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