Have you ever made a bathing suit yourself or even thought about it? Once you find a pattern that suits you (no pun intended) you'll be amazed at how easy it is to construct your own suit. If you're at all timid about the process I suggest starting with a swimsuit for a little girl. The fabric requirements will be minimal and the child you make it for isn't likely to complain much if it isn't quite perfect. Check out sewsassy.com for a great selection of swimwear notions and even a few patterns.
Awhile back I featured swimsuit sewing tips in a previous It's Sew Easy TV show. If you haven't seen it, you can watch the video for show 1109-1 HERE.