These are the Ultra Sheer Bikini and they're made of a comfortable stretch nylon material
I actually own several pairs of these in different cuts, I don't know how they do it, but these are super smooth and they're also completely seemless, and rather comfy too.
The 'Girl' Short
What a cool name... Ultra Low Stretch Cotton, You can never go wrong with cotton!
GAPbody has become a fav. of mine, they have great quality and comfortable selection of bras and panties that go up to an XXL and a 40DD. Victoria's Secret is great but I've noticed that with all of their Advertising, the quality has deff. fallen. These items can be found on the GAP website.