Measurements I used to make this jumper:
Body (around): 48 cm
Body (length): 22 cm
Arm (around): 20 cm
Arm (length): 22 cm

This jumper is easily adjustable for different sizes. To make the body piece or sleeves wider (for a larger body or arm around), cast on more stitches. To make the body piece or sleeves longer (for a longer body or arms) complete more rows in stocking stitch* before moving on to the ribbing.

I made this jumper using 2 strands of 8 ply wool, and 7.5 mm knitting needles. I crocheted the pieces together using a 4 mm crochet hook and one strand of the yarn. I also used a handful of stitch markers to help me hold the pieces in place as I joined them. Safety pins would work equally well.