I used the pattern provided (Clare Bare Underwear Pattern), which I measured out with a ruler and freehanded.
Here is my pattern:
A note for next time, if I do this again: I would make the crotch area a bit longer, and make more of a curve for the leg holes in front.
I chose leftover, very lightweight cotton fabric from a previous sewing project (okay, so it's not EXACTLY recycled, but it's not new, either). I don't have a serger, so I skipped right to the hemming part:
A picture of my tidy seams.
This is the part I had the most trouble with, sewing the hem on the crotch curve. I'm not that skilled of a seamstress, so I'm not sure how you're supposed to make un-stretchy fabric lie flat on a curve ...
Last, I sewed on the elastic. There wasn't any fancy "purpley pink" scalloped elastic at our local fabric store, so I just went with some soft, stretchy 1/4" normal kind.
And, the finished product! They look TINY, but the elastic is extremely stretchy. They fit, in an itsy-bitsy teeny-weeny bikini kind of way. And no, I won't model them.