The pattern for the combination was of my own creation, and could have been better fitted. The waist is too low, closer to where I wear pants normally and not my actual waist, and the drawers could have been pleated more evenly. As it stands, the butt looks like a diaper to me. But being this is underwear, meant to protect the corset and provide modesty, so I'm not terribly bothered by its failings.
Lace Trimming: This is crocheted lace I made is "Trimming for a chemise" from Weldon's Practical Crochet, vol. 10. It is sewn onto the neck edge as well as both leg openings. Originally, the scallop points along the bottom were larger and more lace-y, but I wanted something more toned down for Dean. The ribbon is a burgundy velvet ribbon found in the dollar bins at Joann's. Unfortunately, there wasn't enough for the legs as well. I may replace it with a different ribbon later.
All in all I'm quite pleased. I'm currently working on lace to trim Castiel's chemise and drawers, as well as drafting corset patterns. With many luck I'll have all my foundation garments done by April.