I haven't managed to make it through all the comments yet, but something that springs to mind that might work (I've done it in NYC in winter, which isn't QUITE the same, but it's the closest I have): double up on dance tights in nude for the flash of "skin" - they're heavier weight, and much more durable than standard tights (I've had good luck with these: http://www.discountdance.com/d.....=532544108).
Alternatively, a heavy weight nude or white fishnet over a dark tight, to give that flash of lightness might be interesting and help lighten up. I've noticed you wear a lot of skirts with tights, so this is what immediately springs to mind.
(Sorry if these have already been suggested)