they have been made without hems.  that's kind of my point. dynamic clothes don't have edge problems.  that's like saying conforming clothes used to have a detail problem before people started making higher quality clothing.  the problem isn't the dynamics.  the problem is that most (but definitely not all) dynamic clothes are made in a very quick and easy manner.  some creators spend time making details, but most don't.  Fugazi1968 is an exception, pjz99 is an exception, svdl is an exception, and i for that matter am an exception.  but you can look at my Greeting the Dawn and how Lady Littlefox and Sarsa's V4 Fairy Gown performs and see that dynamic simulations have no problem with clothing details.  if i had actually made the shawl in my most recent post opaque rather than partially transparent. you'd be able to see the thickness on that.  the band around the figure's waist also has a thickness. 

i've had problems converting some clothes to dynamic.  but the problems have been fairly inexplicable and completely unassociated with how detailed meshes are handled.