I have been guilty of wearing black Vera Wang leggings as pants. I have read several times that it is a big fashion "no-no" but I liked the ease of wearing boots with a long shirt/sweater. I also am not thrilled with how transparent the leggings become after a few (cold) washes, even though I always hang them to dry.
Enter GAP lightweight black skinny boot pants. Even though you would think of a boot cut as pants with a flare, I find that these pants will work with boots. Mostly it is because I am short and need to hem the length. Where I plan to hem the pants is right were the pants start to flare. I also liked that I snagged these with sale discounts for just $20 each.