Most ride requires swimming shorts. And shirtless. Any loose clothes can get caught on slides and other things.
I know when i was there yesterday there were plenty of people that was dressed per their religion. And my husband wore a tshirt and had no problems on any of the water rides with tubes
I saw a couple of women in a "burkini" swimsuit and those were acceptable. Because of the chance that loose clothing (like a t-shirt) will get caught on things they prefer swimwear. But you can find options online that will fit with your personal needs and the park's policy.
I second what kamron said. You cannot wear loose fitted clothing due to safety issues
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