I really do wear these for daytime and for dress up! I have four pair of Zella leggings. They never loose their stretch and the fabric doesn't ball up. They wash perfectly. I pack mainly Zella's on long trips - they look great with a dressy top/sweater and boots.
I love Zella! I have been wearing Zella for a year already. There leggings are the most comfortable ones I have found that I can actually wear all day.
These are my favorite leggings, even over my lululemons. They are so comfortable and can be worn during working out or just with a longer shirt for day to day wear. I like that it has a little slit pocket so I can stick my keys or money in there when running.