Have you ever searched and searched for the perfect pattern and never quite found it – nothing matching the thing you had pictured? If so, it may be time to design your own.

If you can picture it, you can make it.

Start from something close

You probably already know what you want. The quickest way to get there is to find an existing pattern that is close but not right, and change it. Adapting is far easier than starting from an empty page, and it gives you a working structure to push against.

What you need

A notebook, a pencil, and a good eraser – you will use the eraser a great deal. A ruler or tape measure. That is genuinely all.

Write everything down as you go. This is the part people skip and regret: you will not remember in three weeks how many stitches you increased on that round, and a garment you cannot reproduce is not a pattern.

Gauge comes first

Before anything else, work out your gauge – how many stitches and rows you get per inch with the yarn and hook size you intend to use.

Everything in the design is derived from that number. If you want a piece nine inches wide and you get four stitches to the inch, you need thirty-six stitches. Every measurement in the finished object works the same way.

Measure the swatch after blocking, not before. An unblocked measurement will send every subsequent calculation wrong in the same direction.

Working out the shape

Sketch the finished piece and write the real measurements on the sketch. Then convert each measurement into a stitch or row count using your gauge.

For anything with shaping, work out where the increases and decreases fall and space them evenly. A shoulder that needs to lose twelve stitches over eighteen rows wants those decreases distributed, not bunched at one end.

Expect to unpick

The first version will be wrong somewhere. That is not a sign you have gone about it badly – it is what designing is.

Work the piece, try it, note what failed, and change one thing at a time. Changing three things at once means you will not know which one fixed it.

Writing it up

If you want anyone else to be able to make it, write down the yarn and its weight, the hook size, your gauge, the finished measurements, and every row in order with a stitch count at the end of each.

Then have someone else make it from your notes. They will find the ambiguities you cannot see, because you already know what you meant.