ok, so here's the deal with leggings... they can look cute, and very easily they can look gross.
there are two main factors that immediately create the gross outcome:
1. Crotch Glamour
- first example: this girl obviously has a nice figure and legs... but her crotch has also joined the runway. "hello world!"
note that there are many ways to prevent this situation.
+ skirt
+ shorts
+ blouse
++ tunic (favorite)
- this girl tried... but there is a flesh-toned crotch messing the whole thing up. also note that if you like flesh-toned, get stockings. they are much more flattering.
++same rule applies with stockings! did your mom teach you to leave the house with nothing covering your stockings!? why would leggings be different?
- she almost had it! but when she takes one step, that shirt will rise up and crotch will be on the menu. if she were to pull her tunic down a couple inches (or buy a longer one in the first place), this would have the potential to become cute, instead of bedroom clothing.
++you can always scrunch up a longer tunic and add a cute belt to keep it raised... you can't make a shorter tunic longer.
2. Style
- this girl looks a little slutty... but ignore that for a second. the bottom is a good way to use leggings... EXCEPT for that they are SHEER. what was she thinking?? well... with the top, I guess she wasn't.
+if you wanna go sheer, wear stockings or thigh-highs

- these make you look like your skin is chafing... sorry

- this kitten could still be alive today if this girl didn't kill it. I know the whole leopard print is "in" this season... but it's tacky to make it a main piece, let alone (yuck) leggings.
here are some other examples of noted factors that negatively affect the style that are pretty self-explanatory

now for cute ways to wear leggings!

-her style makes her pull these off. they are bold and it says something about her.
-the tunic makes this a very sophisticated look. note that she isn't crotch rocking.

- shorts can be cool if you have nice ones to blend into the leggings, and boots are a nice

touch.
there might be other ways to make them cute, but keep in mind that just cause YOU can pull them off with crotch glamour or leopard print, it doesn't make it good for the majority of the population.