The pattern is called Cruiser by Cailyn Meyer (free download on Ravelry) and I cast on for the size large. I made a few modifications as I went along:
- I started the afterthought thumb hole after about two pattern repeats (4" from the cuff) because I didn't like how the cuff looked when you started the hole earlier, and I left 7 stitches on scrap instead of 6.
- I still picked up 4 stitches on each side. With decreasing, I decreased 3 stitches every row.
- For the hand I had a total of 8 pattern repeats before decreasing the top, and I made my mitten a little pointier and left a total of 10 stitches at the end for grafting.