Transmog and incomplete/unused sets

I am very excited for transmogrification, but I wonder about 'visually incomplete' teir sets and sets, for one reason or another, weren't used.

Since my main is a death knight, I want to go pick up the awesome looking T8 again. While the helm, shoulders, chest, gloves, and pants are available, but a matching skin for the boots (and I think belt too) is not. I personally would like a visually complete set.

Also, you guys made a uber sexy red colored skin of the DK T8. I think parts of the set, like the helmet, are available as non-teir pieces.
You know these skins:
http://i304.photobucket.com/albums/nn193/DarethDarkaxe/deathknight_tier8_male.jpg

So several Blues already mentioned that Blizzard is planning to allow players to pick up old gear sets in one way or another are no longer available to players. So what about models and skins that were never was available to players?