I just bought these new lace thongs at Old Navy. I LOVE them. You don't feel like you are wearing anything, they are so light and fit great. I wear size 8 bottoms and I got these in a small...they fit perfect!
They come in black, white, gray, beige, mulberry bush, flo pink (shown), fennel blossom and ballerina blue. Only $4 if you buy three or more, or get them for $3.99 online! Great to wear under pants, shorts, jeans, skirts...everything!