First find you fabric, there are stores around that stock a range of swim and dance wear fabrics.
2nd decide whether to hand sew, use a sewing machine or use an over locker and a sewing machine.
3rd Get hold of the Stitchboy patterns, they used to be on the internet but I have them on disc.
Here's one I made earlier:
http://four.flash-gear.com/npuz/puz....1045&k=2444586