I will not elaborate on my opinions of this trend, but I will give you a handy tip:
If you insist on wearing leggings/tights, after you pull them on in the morning, have someone take a picture of you with a flash. If you can see through them, they are not pants and you probably shouldn't be wearing them alone. And, believe me, even if you think no one will notice, WE DO. You would not believe the number of women I've seen who are wearing nothing more than opaque tights under their too-short skirts or shirts.
Here's a good rule: If you'd be uncomfortable wearing that skirt/top/dress without leggings underneath, maybe you shouldn't wear it.
