I was lucky enough to find some lovely merino wool on sale. Perfect for my next Lisbon.
Here is how I made my buttonholes. Straight stich up both sides of button holes. Zig zag up both side of button holes. Go back and forward a few times with a straight stitch at the top and bottom. It needs very accurate sewing but is better than the foot sticking and creating a nest. Next time I might try the embroidery machine.
The merino is lovely and warm and I've worn it almost constantly since making it. I love the cardigan, shame about my machines messing it up. I will definitely be making more of these.