My wife was more than reluctant at the beginning.
I had been getting more & more interested in social nudity. Without telling her what I was doing, I booked us on a nude cruise. Holy cow, was she upset with me about that. She said that she wasn't going. I told her fine, but I was going to go either by myself or I'd find someone else to go with me. She didn't like that idea one bit.
I suggested that we go to a clothing optional resort to try getting used to being naked in front of other people. It took a little coaxing, but she agreed to go.
The first time that we went to a clothing optional resort. We arrived & I disrobed to go check in. she remained fully clothed & I didn't pressure her to get naked. The place was kind of run down & we only stayed about 15-20 minutes.
A few weeks later, we went to a different resort that was much nicer. We pulled into the parking lot & got out of the car. I started undressing & looked over at her. To my surprise, she was undressing as fast as I was! She was still self conscious, but we actually had a good time. We met a lot of very friendly people that really helped he to become more comfortable. At the end of the day, when we started to head for home sshe said that she had a good time & would like to go back again! We didn't make it back there that summer, but have been back a few times since then.
We did end up going on the nude cruise & had a fantastic time! As a matter of fact, we had such a good time that we booked the Big Nude Cruise for the following year before we even got off the ship from the first cruise.
She is still reluctant about being nude at home if she thinks there's any chance someone else will see her, but she has sure come a long way. She no longer has any hesitation about getting naked if she feels like it's totally acceptable for the situation.