I don't get much use of my black cf either, I have never been able to feel comfortable wearing it casually because I find it too fancy. However I use my black woc and black mini all the time. Now that I think about it, I do use my beige cf often, so perhaps it's the black color in the CF size that makes it feel too formal. Also, I picked small over medium, the medium looks even more formal on my petite frame. It's possible that the size and color combination are not working for you, sell it and get what suits you best.