Inspiration for jumper or cardigan if cut down the middle? And I might cut up and lengthen the inner sleeve seam, this creating more of a side seam at the same time so it's not quite so revealing on the sides.
How to sew on a button - let me count the ways! Checkout this awesome image, showing a multitude of different ideas for sewing on buttons. Definitely a way to add a new design element and couture touch to your creations.