I've never been able to wear turtlenecks; they pull at my neck uncomfortably. Well, recently I came to the conclusion that I could solve the problem by wearing a turtleneck dicky instead. It worked! They're nice and loose, not uncomfortable, because the rest of the garment isn't pulling at the neck. If I'm going out, I just pin the back to get the neck to stay closed, no problem. I like lots of different colors, so although there are a lot of places out there with one or two colors, I tried to find stores that had a nice selection.
Turtleneck Dickies - $9.95These are very nice and offer a little extra coverage in the front, if you need it.
The following two I haven't tried yet, but they look promising:
Full turtleneck dickies - $12.00They don't have pictures of all the colors, but the colors seem pretty standardized.
Turtleneck Dickie - $6.75