My wife grew up in a very conservative, religious atmosphere where taking one's clothes off, other than for bathing, was a mortal sin. It was several years after we were married that she'd even undress for sex until after the lights were off and she was safely under the covers. After we were finished, she would get up and race for the bathroom, and come out fully dressed. I, on the other hand, have been comfortable in my own skin for as long as I can remember, and always walk around the hose, and back yard naked. After 30years, she has come to the conclusion that being naked around the house is not a bad thing, and sometimes she will shed her clothing, especially when it's this hot, and walk around in the buff.
Growing in conservative religious atmosphere with closed minded people is a nightmare. Good your wife has overcome her fears about nudism.