If you're ready to jump 'n the jumpsuit trend I suggest visiting the vintage pattern sites. I know, they're completely ridiculous when you have to use the restroom, but I just couldn't resist. (Be kind as you evaluate the pix, I'm hot, I'm wrinkled, I'm ready to end the school year!) It's Butterick 6680 by Willi Smith.
I only made two design changes to the pattern. The first was to increase the width of the pant legs - I think it was a total of two inches. I took a yardstick and put one end at the widest part of my hip and came sort of straight down. I didn't want to width to be extra wide (like my hipss :)), so I brought it in slightly. The other was to add elastic at the waist. I wore it once without the elastic and while it felt fine when I was standing I had some droopy backside! The elastic keeps the crotch line in place. The back view is still not-all-that, but it's certainly better than before. You can read about more of the sewing details by clicking on the PR sidebar picture.
I'm sorry I can't remember the blog I visited recently, but she too had invested in some groovin' vintage jumpsuit patterns. When I started my hunt last year there were many patterns out there - just type in "jumpsuit" in the search box.
Here are my other treasures: