Understanding fabric weight and yarn composition is the single most critical engineering decision when developing a custom clothing collection. In apparel manufacturing, fabric weight is quantified globally in Grams per Square Meter (GSM). Choosing the correct GSM dictates not only garment drape, warmth, and structural integrity, but also how screen printing ink and embroidery stitches interact with the textile surface.
What is GSM in Apparel Manufacturing?
GSM measures the mass of a one-meter by one-meter swatch of woven or knitted textile. A higher GSM signifies a denser, heavier textile constructed from thicker yarn counts or tighter knitting loops. At Rastify Gears in Sialkot, Pakistan, our knitting partners engineer custom knits from 180 GSM up to 520 GSM to meet precise brand specifications.
When specifying heavy cotton fleece (380–450 GSM), ensure shrinkage margins of 3%–5% are factored into pattern grading before cut and sew operations.
Standard GSM Ranges by Product Category
Selecting fabric weight requires balancing silhouette architecture with wearer mobility and seasonal intent. Here is how our production teams categorize garment fabric weights:
| Apparel Category | Recommended Fabric | Weight (GSM) | Recommended Decoration |
|---|---|---|---|
| Streetwear Hoodies | 100% Combed Cotton French Terry / Fleece | 380 – 480 GSM | Puff Screen Print / Chenille Embroidery |
| Oversized T-Shirts | Compact Combed Ring-Spun Cotton | 220 – 300 GSM | High-Density Screen Print / Plastisol |
| Sportswear & Track | Polyester / Spandex Interlock Knits | 240 – 320 GSM | Sublimation / Flatlock Embroidery |
| Terry Robes & Knits | 100% Ring-Spun Cotton Terry Toweling | 400 – 550 GSM | Tonal 3D Embroidery |
Yarn Composition and Fiber Selection
While GSM determines thickness, fiber composition determines performance, hand feel, and longevity:
- 100% Combed Ring-Spun Cotton: Ultra-soft hand feel, superior breathability, and optimal ink absorption for plastisol and water-based screen printing. Ideal for luxury streetwear and lounge collections.
- 80/20 Cotton/Polyester Blend: The global standard for athletic hoodies. The polyester core provides dimensional stability and reduces shrinkage, while cotton face loops ensure comfortable contact with skin.
- 100% Polyester Performance Interlock: Engineered with moisture-wicking and quick-drying finishes for technical sportswear, cycling jerseys, and athletic tracksuits.
- Loopback French Terry vs. Brushed Fleece: French terry features unbrushed yarn loops on the interior for four-season breathability. Brushed fleece undergoes a napping process creating a plush, insulating fleece pile.
Custom Fabric Development in Pakistan
Rather than restricting clients to off-the-shelf stock fabrics, Rastify Gears develops custom textiles tailored to your tech pack. Clients can provide sample swatches, Pantone color codes, or required stretch specifications. We test tensile strength, colorfastness to washing, and shrinkage margins before initiating full production runs.
“Precision in fabric knitting prevents 90% of downstream garment defects. Developing the correct yarn gauge and loop density during pre-production sampling ensures consistent sizing across thousands of production units.”
Rastify Technical Production Desk, Sialkot
How to Specify Fabric in Your RFQ
When submitting your inquiry through our Start Building system, specify your target GSM, composition preference, and whether you require custom dye lot development. Our engineering team reviews your tech pack and prepares pre-production swatches during the initial sampling phase.
