How to Specify Clothing Fabric GSM and Composition for OEM

1. Separate fabric GSM from finished garment weight

Begin the OEM brief with the menswear product and its intended use: a structured everyday tee, a breathable polo, a textured waffle top, or a fleece sweatshirt. GSM means grams per square meter and describes fabric mass over a known area. It does not describe the total mass of a completed garment. A larger size, longer body, wider sleeve, lined hood, heavy rib, or additional pocket can increase garment weight without changing the main fabric GSM. If your buying team tracks garment weight for shipping or product positioning, list it as a separate reference tied to a specific size, pattern, trim package, and fabric condition.

Specify whether the target applies to finished fabric after the agreed processing, rather than leaving the factory to assume an unfinished mill weight. Add a tolerance that the supplier can assess for the selected material, and agree a measurement method and sampling approach before approval. Do not assume one measurement represents every roll or color. For example, a request for a 240 GSM finished jersey tee remains incomplete until construction, composition, finish, and acceptable variation are defined. Treat any numerical target in an initial brief as a sourcing requirement to confirm, not proof that an available fabric already meets it.

2. Specify fiber composition, yarn count, and fabric structure together

Write fiber composition as percentages totaling 100 percent for each distinct fabric component. The main body, neck rib, polo collar, cuffs, pocketing, and lining may use different materials, so a single composition line can create avoidable ambiguity. State whether cotton, polyester, viscose, elastane, or another fiber is required and whether substitutions need written approval. If a particular fiber origin, recycled content, or other sourcing claim matters to your purchase, request appropriate supporting documentation and identify any verification required for your market. A quotation, swatch label, or supplier description alone is not an independent laboratory result and should not be presented as one.

Next, identify the construction and yarn specification instead of relying on GSM to communicate everything. For tees, distinguish single jersey from interlock; for polos, define the intended pique or other structure; for waffle tops, describe the texture scale and structure; for fleece, distinguish loopback from brushed-back material. Woven fabrics need their weave and relevant warp and weft details identified. State the yarn count system, such as Ne or Nm, because a number without a system is ambiguous. Include ply and spinning details where they affect the product. Ask the factory to propose missing technical parameters and mark them for approval rather than silently filling gaps.

3. Turn handfeel references and shrinkage expectations into approval checks

Handfeel needs a shared reference because terms such as premium, heavyweight, soft, and crisp mean different things to different sourcing teams. Send a physical reference swatch or garment where possible, then describe the qualities you want to retain: dry touch, smooth face, compact structure, fluid drape, restrained stretch, or a substantial but flexible body. Identify which qualities are essential and which are negotiable if the factory proposes an alternative. Photos and videos can help communicate surface appearance, but they cannot reliably establish softness or recovery. Specify requested finishing, such as brushing or compacting, and compare references at the same stage of washing and finishing.

Set shrinkage expectations around an agreed care procedure rather than requesting zero shrinkage without a measurement basis. Define washing conditions, drying method, number of cycles, and how samples will be prepared and measured. Record length and width changes separately, and assess twisting, distortion, collar behavior, and overall fit where relevant. Acceptable limits should match the product, material capability, and buyer requirements; they should not be invented after a sample is washed. Check finished garments as well as fabric when fit is important, because seams, rib components, and pattern decisions can affect the outcome. Retain the measurement records and obtain approval before changing the material or process.

4. Issue a quote-ready brief and control sample-to-bulk changes

Consolidate the decisions into one version-controlled brief that includes the style code, product type, reference size, intended fit, fabric GSM and tolerance, component compositions, yarn details, construction, finish, color references, and shrinkage checks. Separate confirmed requirements from points awaiting factory proposals. Ask the China OEM supplier to identify whether the quoted material is available stock, a close alternative, or a custom development, since those routes may change feasibility, cost, and timing. MOQ is 100 pcs; confirm how that minimum applies to your proposed style, color, and size breakdown, and whether the requested fabric creates additional sourcing constraints before placing the purchase order.

Plan samples for approximately 7 days once the brief and materials are confirmed, not automatically from the first inquiry. Confirm what that sample stage includes, particularly if custom fabric development, dyeing, or additional verification is requested. Bulk timing depends on quantity and should be agreed after the material route and approval sequence are clear. Use an approved swatch and garment sample as the production references, recording any deviations that were accepted. Before bulk release, check the current specification against the purchase order and require approval for substitutions. If laboratory testing is needed, agree the laboratory, method, scope, and responsibility without implying that unperformed tests or certifications already exist.

Questions before sampling