About my own knitting, here is my progress on the collar:
You're seeing the wrong side of the collar, now that I look at this photo. I was partially inspired by the wide collar of the Gatsby Cardigan in Anne Budd's The Knitter's Handy Book of Sweater Patterns. My cardigan's collar will continue the horizontal ribbing of the button band, and pick up the K2P1 ribbing of the waist band. I decided against adding another button.