I'm feeling a bit more 'back in the saddle' today so I thought I'd share a tip that my Mum gave me this week. She said that she often combines yarns to get the desired weight if she doesn't have what the pattern recommends, or prefers to substitute another yarn to that given in the pattern. For knitting up, simply use double i.e. two strands the yarns listed below:
If you need sport weight yarn (baby or 4 ply), combine 2 strands of fingering (2 ply) yarn
For worsted weight (Aran) combine 2 strands of sport weight yarn
For Bulky yarn (chunky) combine 2 stands of worsted weight yarn.
Playing around with different yarns in different combinations can also achieve really interesting textures. if you're unsure of the compatiability of a yarn with your pattern, do a tension square and see how many stitches you need to achieve the same size as recommended in the patttern. You can also achieve the correct tension by using different needle sizes to those recommended in the patter - again, use your tension square as a guide.