If i like my exercise clothes i'm more likely to wear them. If i wear them i'm more likely to exercise. Fact?
Don't go black go bold with your leggings.
If you end up getting expensive ones think of it like the more you wear them the cheaper per wear they become and that you have to get your moneys worth.
A friend of mine confessed to changing into her gym clothes to go to the supermarket every Sunday morning, so incase she bumped into anyone she knew they would think she had just come from the gym as supposed to having just got up and being super hungover - smart girl!