I arrived in Rovinj a day earlier than planned and had no hotel; I stayed at Valalta and I asked if I could stay as a single and they said, sure, and seemed surprised by my question. They explained that it was a nudist resort.
I dressed for the evening meal and for breakfast. Other than that, I was nude at the pool. I really enjoyed the waterslide and the beach areas; even though it was cool that day.
I was dismayed to see some swimsuits though; I'd think that at a nudist resort, nude was the rule.