Swimsuit shopping is the worst. Why not cut out the middle man and make your own?
These videos from Threadbanger.com should get you started nicely. All you need is the old clothing that’s probably cluttering up the back of your closet at this very moment.
I think the board shorts idea is really cool and unique, though I wonder how a pair of suit pants will feel when wet. Probably very heavy. And I would highly recommend inserting some kind of padded liner (found at your local fabric store or joanns.com) to the bikini top pattern. You know, for modesty’s sake.
Let me know how they turn out!