GSM is a number.
Handle is a decision.

Start with the garment

Before asking for a GSM, describe the product. Is the tee meant to hold a boxy shape or fall close to the body? Does the polo need a clean, structured appearance? Is the co-ord intended for warmth, movement or a softer everyday feel?

Those questions create a useful selection brief. Weight becomes one part of it, alongside composition, yarn, construction, finish and cost.

Compare like with like

Two swatches with the same stated weight can give very different impressions. Put the options beside the reference garment, and describe what feels right or wrong: surface, softness, drape, opacity and structure.

Record the construction and finish attached to the swatch you approve. A loose description such as “soft cotton” leaves too much open when another person has to source or reproduce it.

Review after the intended wash

A swatch is only part of the decision. Evaluate a sample through the intended care process, then check the appearance and measurements against the agreed requirement.

Shrinkage behaviour is affected by construction and processing, among other variables. Agree the method and acceptance criteria for the particular programme rather than borrowing a tolerance from an unrelated style.

Build a useful fabric brief

• The reference garment or physical swatch.
• Composition, construction and target weight.
• The intended finish, colour and surface appearance.
• Fit, performance and care requirements.
• Target price, quantity and delivery window.

The goal is a fabric decision another person can understand and act on. The best starting point is often a real reference, followed by precise questions.