If you are new to fashion design, you’ve likely heard the terms "Tech Pack" and "Spec Sheet" used interchangeably. While they are related, they are not the same thing.
Understanding the difference is crucial for communicating with your manufacturer and ensuring your samples come out right the first time.
Defining the Terms
What is a Spec Sheet?
A Spec Sheet (Specification Sheet) is a single document focused almost entirely on measurements. It lists the dimensions of the garment for every size (Small, Medium, Large) and defines the "tolerances"—how much a measurement can vary before the garment is considered defective.
What is a Tech Pack?
A Tech Pack is the entire master document. It is a collection of several sheets, one of which is the Spec Sheet. The Tech Pack includes the "specs," but it also includes the sketches, the BOM, the construction notes, and the branding requirements.
"Think of the Tech Pack as the book, and the Spec Sheet as one of the most important chapters in that book."
Key Differences at a Glance
- Scope: A spec sheet is about size; a tech pack is about the entire product.
- Detail: A spec sheet won't tell a factory what kind of zipper to use, but a tech pack will.
- Purpose: A spec sheet is used by quality control teams to check fit. A tech pack is used by the entire production team to build the garment from scratch.
When Do You Need Which?
In reality, you rarely use a spec sheet in isolation during the early stages of design. You need a Spec Sheet when you are doing fit sessions and grading (creating different sizes). You need a Tech Pack the moment you want to move from an idea to a physical sample.
Why Beginners Should Start with a Full Tech Pack
Many first-time founders try to save time by only sending a spec sheet and a photo of a garment they like. This is a recipe for disaster. Without the construction notes and BOM found in a full tech pack, the factory will make their own decisions on your behalf.
They might use a cheaper stitch or a lower-quality thread to save money, and you won't have any grounds to complain because it wasn't specified.
By using a platform like TechPackApp, you can build a complete tech pack that includes your spec sheets automatically. This keeps all your data in one place and ensures that when your brand grows, your documentation is already professional and scalable.
Can I use a spec sheet without a tech pack?
Only if you are working with a factory that already has your design on file and you are just updating the sizes. For new designs, a spec sheet alone doesn't provide enough information to manufacture the garment correctly.
Does a spec sheet include fabric details?
Generally, no. Fabric details belong in the Bill of Materials (BOM) section of the Tech Pack. A spec sheet is strictly for measurements and fit data.
When do I need to update my spec sheet?
You should update your spec sheet after every "fit sample" you receive. If the sample is too tight in the waist, you update the spec sheet with the new measurement before the next round of production.