As for the cotton crotch lining, do you know what I do for that? I take an old, 100% cotton, white t-shirt, find some nice areas, and cut the crotch lining from it. It would be great to stock up on colorful, 100% cotton t-shirts from ACMoore, but my preference is a white crotch lining due to dyes. I know, I know, black would look so much better, but you just don't see that when they're on.
I love them! They're a great fit, although the green/black ones are more like Spanx lol. I cut the pattern pieces on the crosswise grain, not the lengthwise--operator error. I wasn't paying attention and was trying to watch Harry Potter while cutting out the two pairs. Also, Jumbo Spandex is not my preference for panty fabric. It runs on the thick side, but when there is so much in the stash and you want to whip up panties using an elastic foot, you just use it.
Speaking of which, the elastic foot is WONDERFUL!!! No more measuring for a 3/4 ratio of elastic length. The elastic is fed into the foot, insert the fabric underneath, and start stitching! It stretches the elastic for a snug fit. I used a flat construction method to avoid stitching in the round because I was using the serger. Panty construction takes about 1/3 the time than what it would with a conventional machine, and most of the time savings is due to that awesome elastic foot.
I can only imagine how wonderful it would be on a bra. I think the green/black panties need a matching bra, don't you think?