My Old Sweater = Baby Pants
I wish I had remembered to take a "before" picture. This used to be a short-sleeved sweater from Express. I never wore it because it was too tight, but I always really loved the stripes and colors. So I flattened it on my cutting table, put my pants pattern on top (minus the butt panel; I figured this one was stretchy enough that it would fit over E's cloth diapers just fine) and cut away.
It was a little nerve-wracking, to be quite honest. But they fit him great and definitely look cuter as baby pants than on me, so I'm happy with the result.