Take one slightly hideous gold cushion cover circa 1970, a tiny scrap of blue cotton, a quick scribble, and away we go.
I used my beloved friend pinterest here to research cossie ideas; then, the design was drawn up by Rowan and me.
I didn't make a pattern, just made it up as I went along: much more fun than measuring and following instructions.
The collar is fastened by velcro, which is easy for a boy to do and un-do.
The little wrist guards just slip on.
And the belt is elasticated at the back, so is easy to get on or off.
I have made a small boy very happy, with very little effort. It's made me rather happy too. The only downside was he was buzzing so much from such a great day today, he's only just gone to bed!