Anyways, I found some actual legitimate swimwear fabric (four-way stretch lycra, actually), but no patterns. Not that that could stop me. Hah. I used a cap sleeve tshirt that currently fits each girl, and just traced that on the fabric. I had to hurry because of the overnight guest thing. I sewed the shirts, put 1/4 inch swimwear elastic in the collar (from my diaper making stash), and used the serger to make lettuce edging on the sleeves and hem.
For the lowers, I traced a pair of stretchy pants (that were also current size), and cut them out of black lycra. I serged these together with the seams outwards, to guard against any chafing. I had to think awhile on the skirty part. I had promised them a suit with a skirt, but I wanted it to be nice and modest. I measured them each appropriately, then cut the skirt in a half-circle (one piece), so it had some twirl-room.
I attached the waist elastic (3/4" cotton braided) to the 'shorts' and skirt in one move, then turned it inside and stitched it down.
I lettuce-edged the skirt hem, and left the leg cuffs raw. These nice knits don't ravel, you know. :) It ended up a bit longer than I had planned, but I think it works wonderfully anyway. What do you think?
Also, in the photos, they mixed up their shirts... Big Sister is wearing Little Artist's, and vice versa.