No, I do mean excessive material as a Burqini. Apparently it's a hygiene thing.

Like I said above, my father has been a swimming pool manager for over 30 years, and I have seen him on numerous occasions ask people to get out of the water if they are swimming in non-approved swim wear for public swimming pools. I believe (although am not 100% sure) that wet suits are also not allowed during hours that the pools are open to the public.

"Indoor pools have stricter dress codes than outdoor pools: in outdoor pools, men are often allowed to wear t-shirts for modesty or for protection from sunburn, but in indoor pools they must usually go shirtless. At beaches, many people swim with clothes on and wear beachwear, but at pools (especially indoor pools) more minimal attire is often worn, such as lycra briefs for men or lycra one-piece tanksuits for women. Swimming with clothes on often results in objections from lifeguards at pools, especially indoor pools. In France, board shorts are usually not allowed for hygiene reasons"

http://en.wikipedia.org/wiki/Swimming_pool