The only two dresses where that would be moderately feasible are made of fabrics that I either don't like or think would be a nightmare to work with; the others are not cut in ways conducive to making skirts. Also I don't have a sewing machine and the idea of trying to hand-sew a skirt out of a dress with no pattern and no experience in such projects sounds like the epitome of a bad idea to me. *shrug*

My sewing skills are limited to hemming, closing small tears, making discreet tucks in elastic waistbands, and reattaching buttons. Anything more complicated than that either gets tossed or goes to a tailor -- as happened with my winter coat a few years back, because I love that coat, I intend to get another fifteen years of wear out of it, and I was not going to throw it away over a busted zipper.

I am very picky about turtlenecks for that exact reason. Most of mine are either slouchy enough that they're halfway to cowl-necks, or they're mock-turtlenecks and therefore don't have enough fabric to get really constricting.

Congrats on your pruning!