In the context of material weight, oz stands for ‘ounces per square yard’.
As an example, if a material of size four yards squared weighs 20 oz, then the ‘fabric weight’ will be 5 oz (20/4).
Jacket linings, undergarments and lightweight performance wear.
Regular and lightweight shirts.
Thick or heavyweight t-shirts.
Light and medium weight sweatshirts, light suits and blazers.
Heavy weight sweatshirts
Heavier cloths, such as flannel and denim jackets.
Extra thick sweatshirts, woven outerwear, or sports coats made of thick material.
Fabric Weight Breakdown
2.5 - 4oz (Very Lightweight)
Cloths in this category are very light, and are usually very breathable, making them great for summer.
4 – 7oz (Lightweight)
Clothing made of lightweight material can potentially be worn all year round. For example, a t-shirt can be worn during the winter, given correct layering.
7 – 9oz (Medium)
Slightly heavier/lower-midweight. Includes ‘linen’ as a material, which is known for producing light weight variants of traditionally heavy clothing, such as suits and blazers.
9 – 11 oz (Medium)
Transitional garments that are appropriate to wear in the Spring and Fall. Could potentially be worn year round, though it will be on the lighter side.
11oz – 12oz (Heavy)
Can be worn all year round. Heavier or lighter fabrics may be better for certain seasons, but 11-12oz is usually safe and appropriate for general wear.
12oz – 14oz (Heavy)
Fabrics that weigh between 12-14 ounces are considered ‘heavier fabrics’, and are most suitable in the winter. Usually heavy enough to insulate, but still maintain maneuverability without being too bulky.
14oz+ (Very Heavy)
The heaviest category of cloth weight which is generally used for outerwear, such as overcoats, or upholstery. It is insulating, and generally doesn’t let in a lot of air.