Cloth.stretchingStiffness

Description

Stretching stiffness of the cloth.

Must be greater than zero and smaller or equal to one.
In many cases, when you want a cloth to be more stiff, actually reducing the number of vertices will get you better results - and performance.

using UnityEngine;

public class Example : MonoBehaviour
{
    void Start()
    {
        GetComponent<Cloth>().stretchingStiffness = 1;
    }
}