4 – Choose your yarn and work out approximately how much you’ll need
If you’re an experienced knitter you’ll probably have some idea. It also helps to look at other people’s projects from the same yarn on Ravelry. Find a few similar garments in a similar size and check how much they took. Then add some extra for swatches and to be on the safe side.
Note: I did it the other way around: Fell in love with the yarn first and bought a generous quantity. Far too generous as it turns out. Never mind – it only means that I have enough left for a hat and a scarf.
5 – Swatch
a – First swatch to decide what needle size you’re going to use: how open, drapey or dense do you prefer your knitted fabric for this project? Knit generous swatches – aim for at least 12 x 12 cm/5 x 5”. Wash your swatches and leave them to dry flat, or block and/or press them, just like you intend to treat your finished sweater.
b – Then knit more swatches. This time in different stitch patterns and ribbings you might want to use. Again wash/block/press them.
6 – Decision time
Decide what needle size(s) and pattern stitch(es) you’re going to use, how wide your ribbings and button bands (if any) will be, exactly what your neckline is going to look like, where any pockets will be placed etc. Add details to your diagram if you think that will be helpful.
7 – Start knitting the back
Using your swatches, calculate how many stitches you need to cast on. Do you need to increase or decrease for, say, an A-line or waist shaping? Write down everything you do and keep your notes together. It isn’t necessary to work everything out beforehand. You can think about the armhole, neck and shoulders while knitting.