Check out this new tutorial where Freelance 3D Artist Alexandre Albisser shows how to create a procedural system in Blender Geometry Nodes that automatically adds hems to animated clothes.
Albisser walks through a Geometry Nodes setup to make complete-modeled and detailed Hems along the edge of a mesh in a single click, working off a vertex group selection.
The tutorial also covers creating custom shader attributes to shade this nicely with seam puckering effects without needing a too-high poly version.
Alexandre often posts about procedural systems, like creating mud that can stick to a tire. Check out this previous tutorial that shows how to make it so you can have dynamically sticky objects in the scene.