Sewing help?

[sheana.livejournal.com]

Hi all :)

Here's my problem. I recently found vintage pattern I adore, but it's from 1950-something and it's a size 14, and I'm a size 18-20. Does anyone have any tips on modifying the pattern so it will work for me? Should I just move all the lines out however many inches, or...?

Thanks!