what style of swimwear should men wear for water aerobics?

Want to say thanks to all of those who responded to my question.
I have been in aquabics for about a year now and the results are super.
Our classes are about half male so guys should not feel shy about joining. The two instructors mix in some boot camp style exercises for the pool, running in the water and some exercises even drawn from synchronized swimming. In some cases we partner up for the exercises.
I have burned off so much fat that I now need a smaller belt as my original one was making me too buoyant in the water.
The instructors encourage the males to wear form fitting swimming costumes as the shorts and trunks bag up and fill up with water and make movement awkward. I were my speedo brief or jammer and sometimes a rashtop if the pool is cool.
After the class I also take time to swim lengths and do some stretching on the pool deck.
Guys should give it a try. It is not fem at all and a 55 minute workout is great.