Perhaps you’ve got your eye on a vintage pattern, but it’s not in your size? Or maybe your first attempt at a pattern came up too small/too big and you don’t want to repurchase or reprint the pattern? Maybe a pattern company doesn’t work with your size?
Well, luckily for us, I recently came across a post explaining how to size up/down sewing patterns, and it couldn’t be easier!
Go grab your pattern that you want to size up, some tracing paper, a pencil and a ruler and you’re good to go.
Lay your original pattern over your tracing paper and draw the outline (pencil or tracing wheel). This will be useful when you come to add to it. Then all you need to do is measure the space between the size lines on your original pattern – the difference is how much you need to add to your new outline.
From your original outline, measure outwards by the measurement you collected in the last step and mark with a dot/line. Ensure to do this at regular intervals along your pattern lines, considering any darts and other outwardly/inwardly protrusions. Now just connect your dots up using either a ruler or french curve, as necessary.
Make sure to transfer darts, notches and any other pattern markings and cut it out. You’re good to go.
At this stage I’d encourage you to make a toile/muslin to check the fit before using any nice/expensive fabric.