you know, i never had a problem using edges in dynamic clothes.  not my own, and not those of others.  Lady Littlefox's stuff is great dynamic, and one of my many unfinished works used a dynamic version of the Masquerade's Eve panties.  came out just fine, with no trouble.  i have trouble making nice edges in general, but once they're made, i've never had a problem running a sim nor keeping them.