I always enlarge patterns on my copy machine at home. First, copy the page from Corsets and Crinolines, if you are using the post edwardian pattern you just need to drag it to your desk top then print it out.
Once that's done enlarge that copy (or printout) 200%. I enlarge the corner with the scale first, and once it is the correct size I copy the whole pattern, rotating and rearranging the page until the entire pattern is enlarged. This percentage can be a bit different for each copier, but mine was 195% so that should give you a good starting point.
Then start puzzling the pieces together. If you use a window as a light box you can slide the pages right in place.
When you have all the pieces together you should have something that looks like this.
Tape the pieces together then mark the waistline, which is right between the two dashed lines, (this is already marked on the post edwardian), and measure across. Did you get approximately 10 1/4 inches? I did. Double that number to figure what the total waistline will be. My guess is we'll all be altering this pattern to be larger.
You may be wondering, why not just copy the pattern from the get go at 400%, assemble the pieces, measure across the waist and be done with it. It will be close enough since alterations will be made anyway, right? Yes it will. I just like precision and that precision starts with enlarging the pattern to the correct size.
Later this week we'll take our measurements so next week can officially start the sew along!