Here’s a little tutorial I wrote on how to enlarge a cross stitch CHART to double the finished size of the design without having to change the thread count of the fabric.
The basic concept is easy. You just redraw the original chart so that every square in that is four squares in the new, bigger version:
Let’s try this with something simple like a fancy letter T:
This letter is 20 stitches high. You can change the finished size somewhat by using a lower thread count fabric (14 instead of 18, for example), but that may not be enough bigger, and it may not have the look you want.
So redraw the chart with each square from the original now four squares (in a 2 by 2 block), like this:
It’s bigger, all right! Twice as high, and 4 times as many stitches. But it looks really blocky, compared to the original. So the next step is to fill in some of those too-obvious angles. I’m showing the extra squares in a different (darker) red so you can see where I’ve added them:
And here it is again with the extra squares (plus a few more – I decided there were still a few places that could use some smoothing out) the same color as the rest:
Now it’s done: the letter T, when stitched, will be twice as big without having to change the thread count for the fabric.
If you want something other than exactly twice as big, you’ll need to change the fabric count anyway. Say the original chart is for use on 14-count Aida. At 20 stitches tall, that would be almost an inch and a half. The new chart is 40 stitches tall, which is almost 3 inches on 14-count, but on 18-count it’s closer to 2 and 1/4, and on 28-count (my favorite) it’s the same size as the original could be on 14-count, but with a more smooth shape.
It gets more complicated when you’re working with more than one color, but the basic idea is the same. Just remember that with multiple colors, you’ll want to smooth out the edges of each color, as well.