How many times have you been stuck wondering what is the best yarn to use for your next project? There is such a wide variety of yarns available now that it can be a bit overwhelming trying to make a choice. My personal preference tends to be for wool, especially for babies, because it is a natural fibre that “breathes” and is very warm. The modern range of yarns, however, contains an ever expanding number of different fibre types, and also blends of different fibres.
One of the first things to look at on your pattern is whether or not it is written for a particular unique yarn, or is suitable for one of the more general types of yarn like 4ply, 8 ply, 12 ply etc. If the pattern is very yarn specific then you are best to stick with that for your project.
A lot of patterns are still designed for more standard yarn types. Obviously it is safest to use what is recommended in the pattern, but if you want to use something different there are several really important things to consider.
Ply and Needle Size
Always make sure that you get the same ply/weight yarn as that used in the pattern. It is also essential to do a test square to check that your gauge is correct, and alter your needle size accordingly if it is a bit off.
The composition of yarn can make a huge difference to how far it goes. A ball of acrylic yarn can be up to 30% longer than a ball of wool of the same weight. Cotton can be similar to, or slightly shorter than wool, and blends of acrylic and natural fibres will be different again. Always check the band on a ball or hank for the length and the batch number. Make sure you know what the length of a ball is for the yarn used in your pattern and work out from that what you will need in the one you are choosing. If you are in any doubt err on the side of caution and get extra.