Studio says to "cover your body"

Hi everyone. I'm looking to join a new yoga studio, and I saw the following note in their FAQ: "we request that all guests wear appropriate clothing that covers their bodies". I'm wondering what's considered "appropriate" or not in this context, as it's heated vinyasa yoga set to 98ºF. I usually practice in spandex shorts and a sports bra, as I get extremely sweaty, and it's never been a problem, but the verbiage "cover your body" is weirding me out a little. Am I overthinking this?

UPDATE: They finally got back to me (they don't have a phone number to call and I was waiting for them to email me back) and said that spandex shorts and a sports bra are fine. A lot of people here guessed that they've probably had people show up in next-to-nothing, and I think that's probably right, and they're just trying to cover their bases with more obscure language. I personally think they should update their verbiage to be more clear, but oh well 🤷‍♂️ Thanks for the input everyone.