Can people tell me what yarns they tend to use for children's knits?
I have misguidedly agreed to knit a stripey jumper for my son who wants melange type effect or "speckles" but all that type of wool seems to be quite expensive? I've no interest in buying 70 euros worth of wool for him! 
It can't be itchy either which is why I tend to stay away from pure acrylics, but at this point my head is wrecked looking at wool online and I am open to all suggestions!!
Pattern says I'll need about 1200m of wool; it is this pattern if you are interested: - The Montrealer He recommends worsted weight.
Designer's wool suggestions are way too expensive 
Thank you for reading!