Very easy to knit with ribbon yarn. But you can knit it in every yarn you will.
Knit almost seamlessly, almost in the round, with three buttons.

The patterns size is M/L - this size because of its loose fit - you don’t need get a perfect fit with this cardigan.
But if you want to make it larger or smaller you can add or delete some stitches.

2011-05-17 better instructions for decreasing.

Happy knitting!