What characteristic of water-repellant fabric makes it desirable?

The characteristic that makes water-repellant fabric desirable is its breathability. Breathable fabrics allow moisture vapor from the body to escape while keeping water droplets from penetrating the material. This feature is particularly important in apparel because it helps maintain comfort and creates a more pleasant wearing experience, especially during activities that induce perspiration.

While being completely waterproof might seem advantageous, it can lead to discomfort as such fabrics often trap sweat and heat. Lightweight fabrics contribute to comfort as well, but they do not specifically define the water-repellent characteristic. Resistance to fading in sunlight is beneficial for the longevity of the fabric's appearance but does not relate directly to its water-repellent properties. Thus, breathability is the most relevant aspect that enhances the functionality and desirability of water-repellant fabrics in clothing.