When did you all become nudists?

Growing up we only had one air condition and it was in the living room. Me and my sister we did share a bedroom. At the time we just wore shorts and that was all. My parent's really didn't care at all. When we moved to Kansas we had a creek right by the house. My mom told us to just go play in the creek and don't get in trouble. We usually went to the creek it was like our playground. I remember once my sister was like let's go swimming and she took off all her clothes and jumped in the water. I imagine that could have been the first time.