Ok, for those who are saying "I wear mine with long tos/big cardy etc and look great in them"
No.
You don't.
Honestly.
I am saying what your best friend should be saying.
Any tight legged clothing, be they leggings, jeggings or skinny jeans, with a long top, especially a non-fitted one (so the kind you wear when you are trying to "hide" your wobbly middle) don't make you look slim. It doesn't hide your wobbly middle, or your flabby belly, or trick anyone.
If you have slim legs you look like a balloon on a stick, if you have chunky legs you just look fat.
Sorry, it's the truth. Get someone to take a full length photograph of you, I promise you you will be horrified and throw away your skinny jeans/leggings/jeggings and slap your best friend for not telling you that you looked so fucking awful in them.
They only look cute on children, slim, athletic children. Jeggings and chunky don't mix at any age.