A simpler way to create natural looking edges - not as detailed as a full rounded rectangle, but much faster in both the modeling app and the cloth simulator - is simply extruding the edge segments inwards for about 1-2 millimeters and assigning only the new edge vertices to the soft decorated group. Useful for "narrower" openings that hardly allow for a good look at the inside of the cloth, such as armholes and necklines. Less useful for the hem of a wide skirt or the trimmings of an open jacket.

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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