Thanks for all of your replies- I'm glad i wasn't too off on the bag!
Now to these pesky camiknickers... I'll take pictures tommorow of the inside seams- they're all hand stitched french seams- (thats what i've always called the enclosed type of seams, not sure if its the technical term) and I'll get some picture of the press studs- they're silver coloured metal snaps.
there are some things I've noticed about the camiknickers that might be worth mentioning- you can't step in to them to get them on, the only way to get them on is to open the snaps at the crotch and pull over your head. The snaps at the side don't go down enough to allow you to pull over your hips. I couldn't fit the camiknickers on my mannequin, and she has a 24" waist. And that isn't because the camis are super small either, the measurements are bigger than my mannequin.
There's really no extra fabric on these that would allow me to do a burn test. All the seams are enclosed, and with the scallop edging being stitched over as a finish there's no hem I could snip a bit of fabric out of. It doesn't feel like a poly, but then again i know there are some sophisticated polyesters out there.
The faggoting is only used as a 'v' shape on the front and back- I noticed that the bottom knickers part below this v are cut on the bias- and the top half on the straight grain.
the outside edges are scalloped with a stitch that is almost like a blanket stitch, but there's a bit more to it. It looks like this stitching was put into place and then the fabric was cut to reflect the scallop shape, if that makes sense. You can tell because there's still a small line of the fabric on the outside of the scallop
Anyway, I'll post the pictures tomorrow, thanks for all you help!