Fabric GSM Guide for Custom Streetwear: T-Shirts, Hoodies and Fleece

What Is GSM in Fabric? A Guide to Choosing Fabric Weight for Custom Streetwear

Understanding GSM in Custom Apparel Manufacturing

When researching custom clothing manufacturing, one of the most common technical terms you will encounter is GSM.

GSM stands for grams per square meter. It measures the weight of a fabric based on how many grams one square meter of that fabric weighs.

For streetwear brands, GSM is an important factor because it affects the garment’s weight, structure, drape, warmth and overall wearing experience. However, GSM alone does not determine fabric quality.

Two fabrics with the same GSM can still feel very different because of their fiber composition, yarn quality, knitting structure, finishing process and washing treatment.

Understanding these factors can help brands choose the right fabric for heavyweight T-shirts, oversized hoodies, sweatpants and other custom streetwear products.

What GSM Is Best for Custom Streetwear?

Different garments require different fabric weights. The following ranges can be used as a general reference when developing a streetwear collection.

150–180 GSM: Lightweight Fabrics

This range is commonly used for:

• Lightweight summer T-shirts

• Performance tops

• Layering garments

• Tank tops

• Breathable activewear

Lightweight fabrics are suitable for warm climates and products that require a softer, more fluid drape.

However, they may not provide the structured appearance expected from premium heavyweight streetwear.

190–240 GSM: Medium-Weight T-Shirts

This range is suitable for:

• Premium everyday T-shirts

• Structured basic tees

• Polo shirts

• Casualwear

• Mid-weight oversized T-shirts

For many clothing brands, this GSM range offers a balance between comfort, durability and garment structure.

240–300 GSM: Heavyweight Streetwear T-Shirts

This range is commonly selected for:

• Heavyweight oversized T-shirts

• Boxy-fit T-shirts

• Vintage-style tees

• Premium streetwear collections

• Garment-dyed or washed T-shirts

A heavier fabric can create a stronger silhouette and reduce excessive clinging to the body.

However, the final result still depends on the fabric composition, knitting tension, pattern and washing process.

280–360 GSM: Sweatshirts and Lightweight Hoodies

This range is often used for:

• Crewneck sweatshirts

• Lightweight hoodies

• Transitional-season garments

• French Terry tracksuits

• Casual sweatpants

These fabrics are suitable for spring, autumn and indoor wear, depending on the target market and internal finish.

360–460 GSM: Heavyweight Hoodies and Sweatpants

This range is commonly used for:

• Heavyweight hoodies

• Boxy zip-up hoodies

• Structured sweatshirts

• Thick sweatpants

• Premium winter streetwear

Higher-GSM fleece can help create a fuller and more substantial garment.

However, excessively heavy fabric is not automatically better. Brands should also consider comfort, climate, production cost, washing performance and target retail price.

French Terry vs. Brushed Fleece

Fabric weight is only one part of fabric selection. The internal structure and finishing of the fabric also affect warmth, softness and drape.

French Terry Fabric

French Terry, also known as loopback fabric, has a smooth outer surface and visible loops on the inside.

Its main characteristics include:

• Good breathability

• Moderate moisture absorption

• Softer and more natural drape

• Suitable for layering

• Appropriate for spring and autumn collections

French Terry is commonly used for sweatshirts, hoodies, joggers and premium casualwear.

The exact feel depends on the yarn, composition, loop structure and fabric weight.

Brushed Fleece Fabric

Brushed fleece is produced by brushing the inside loops to create a soft, raised surface.

Its main characteristics include:

• Better heat retention

• Soft internal hand feel

• Fuller garment appearance

• Suitable for colder seasons

• Commonly used in winter hoodies and sweatpants

The structure of the finished garment does not depend only on the brushing process. Fabric weight, fiber content, knitting density, ribbing and garment pattern also influence whether the silhouette appears soft, relaxed or structured.

Why Ribbing Matters

The collar, cuffs and hem are important parts of a streetwear garment.

Poor-quality ribbing can lose shape, stretch excessively or become loose after repeated washing. When developing heavyweight T-shirts, hoodies and sweatshirts, brands should pay attention to:

• Ribbing composition

• Fabric recovery

• Ribbing weight

• Knitting structure

• Shrinkage compatibility

• Color consistency with the main fabric

Common options include 1×1 and 2×2 rib structures. Cotton-spandex blends are often used when stronger elasticity and shape recovery are required.

The ribbing should also be tested together with the main fabric because different shrinkage rates can cause twisting, deformation or uneven hems after washing.

GSM Does Not Equal Fabric Quality

One of the most common sourcing mistakes is assuming that a higher GSM always means a better fabric.

A 300 GSM fabric made from poor yarn can perform worse than a well-developed 240 GSM fabric.

When evaluating fabric, brands should consider:

• Fiber composition

• Yarn quality

• Knitting density

• Surface appearance

• Hand feel

• Shrinkage rate

• Colorfastness

• Pilling performance

• Washing stability

• Garment structure

The correct fabric should be selected according to the product design, target customer, climate, expected retail price and intended wearing experience.

How HaoYi Apparel Supports Fabric Sourcing

HaoYi Apparel is a custom clothing manufacturer based in Dongguan, China, specializing in streetwear, sportswear and premium casualwear.

We support brands with fabric sourcing and garment development for products such as:

• Heavyweight T-shirts

• Oversized hoodies

• Sweatshirts

• Sweatpants

• Tracksuits

• Jackets

• Custom casualwear

Depending on the project requirements, our team can assist with:

• Fabric weight selection

• Fabric composition evaluation

• Color and hand-feel comparison

• French Terry and brushed fleece sourcing

• Ribbing and trim matching

• Washing-process development

• Sample development

• Bulk-production quality control

Fabric availability, minimum order quantity and custom dyeing requirements depend on the selected material, color, construction and production volume.

Before bulk production, we recommend confirming the fabric through physical swatches, sample garments or approved fabric standards.

Choosing the Right GSM for Your Brand

There is no single GSM that works for every streetwear product.

A summer T-shirt, heavyweight vintage tee, oversized hoodie and winter sweatpant all require different fabric structures.

The best sourcing decision should balance:

• Desired silhouette

• Wearing season

• Target market

• Fabric hand feel

• Product cost

• Washing performance

• Retail positioning

Instead of choosing fabric based only on a GSM number, brands should evaluate the fabric together with the garment pattern, construction and finishing process.

Develop Your Custom Streetwear Collection with HaoYi Apparel

To evaluate a custom streetwear project, you can provide:

• Product images

• Design drawings

• Tech Pack

• Size chart

• Reference garment

• Preferred fabric weight

• Estimated order quantity

• Printing, embroidery or washing requirements

The HaoYi Apparel team will review the fabric direction, garment structure and production feasibility before starting sample development.