I cast off some time last month and it's been worn several times per week ever since. In fact I'm wearing it right now.
It's a French pattern from La Droguerie; very simple and utterly wearable. I made a light blue version earlier this year which is also well worn. I think I need a green one now. Mmmm, red would be useful too.
If you can't read French, PipiBird has posted some notes on how she made her cardigan, here.