What is the main characteristic of linen yarn?

Linen yarn is primarily characterized by being made from long and short fibers of the flax plant. This natural fiber is known for its durability, breathability, and ability to wick moisture, making it a popular choice in warm weather clothing and home textiles. The unique processing of flax fibers results in yarn that has a distinct texture and luster, differentiating it from other types of yarn such as cotton or wool.

The other choices either do not accurately describe linen yarn or refer to different types of fabrics entirely. For example, lightweight worsted fabric pertains to a specific type of wool fabric rather than linen. A thick wool fabric for jackets is clearly associated with wool, not linen. Finally, a woven fabric with diagonal ridges typically describes twill fabrics, which are distinct from the properties and characteristics of linen. Thus, the correct choice effectively captures the essence of linen yarn's origin and composition.