MANY years ago, I did. Then life (working full time, children & their activities) happened, and there just wasn't time.
I took a couple of classes at a LQS last year to relearn how to work with knits as working with them is so different than the wovens I am used to. So now I can sew simple garments, but would probably have to do several for them to not end up looking homemade.
I've been thinking lately about trying to alter some bathing suits. Incredibly, I have lost some weight and my suits, which were on the expensive side, are now too big. I like the style (tankinis) and fabric better than any that are currently available, and they are in great shape. It's intimidating, though, so have not yet attempted.