First attempt using a vintage pattern (1940s) for my daughter, that she collected. The pattern suggests a 2 or 3 ply wool but found a helpful suggestion here http://csusap.csu.edu.au/~afahey05/help.html that wool was rated slightly thicker in the 1940s than today, so the modern equivalent of vintage 3ply is 4ply. So I am using Bendigo Woollen Mills http://www.bendigowoollenmills.com.au/products.php?cat=51 Luxury 4ply in Brick, which is a lovely rich red. Have made the jumper a little longer as it was very short-waisted and had to go down a size in needles to 3mm for correct tension. The back is finished and the front is progressing, and will be making long sleeves.
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