To replicate the edge of a garment being folded over one or more times, you can use force multiplier for edges feature.
The force multiplier properties of an edge are:
Amount - number of real-life folded layers of the fabric
Depth - depth of the fold
For example, if your real-life garment requires the fabric be folded 4 times, to a depth of 1 cm, to achieve the desired strength:
Set Amount to 4.
Set Depth to 1.
To use force multiplier:
For a quick view of the feature in action, check out the video: Force Multiplier.