"We support FINA's role in setting and managing the rules for the sport of swimming. Their decision today is not unexpected as a means of calling a halt to the confusion and controversy that has been created as a result of the introduction by some manufacturers of fully non-permeable buoyant wetsuits," the statement read.
Yet Brennan says swimwear manufacturers are partially to blame. Swimwear manufacturers have connections to members of swimming governing bodies, she said.
"Bottom line [is] there are all these entangled alliance between swimwar companies and federations of the board," Brennan said. "Those sponsorship deals one of the reasons they didn't act, and in so doing, they damaged their sports for years."
Olsen said before now, there wasn't any mechanism to regulate swimsuits.
"You started to see a lot of companies enter the market, and a lot of new material enter the market. There wasn't any procedure to evaluate them scientifically," Olsen said.
Brennan said she doesn't expect any damage to be done to Phelps' legacy, since he will still be seen as a great athlete. But, she said, people might be confused.
She hopes it will help return some of the intergrity that was missing with what some called "technological doping."
"It's very sad that the governing body of the sport failed to make decisions for the integrity for the sport. It was crystal clear that the world record pace was turning swimming into a joke. Anyone in the sport that had their eyes open could tell something was wrong," she said.
"So now it's like trying to put the genie back in the bottle," Brennan said. "They've got no one to blame except themselves."