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You are going to have to let this all out in the open with her - show her this web site and your page, your pics, groups, friends, etc. I did that and it was tough but after I gave her the show/tour, things were much better. Still can't get her to be nude with me, particularly outside or with others but I'm free to do it now and she knows I do. You have to convince her that going nude and being with others doesn't necessarily mean something sexual is going to happen. It might - nudists/naturists are human and we do have sex but being nude doesn't equate to having a sexual encounter. Anyway, she has to know everything. She doesn't necessarily have to agree with it, particularly right away. Spend time in your home nude whenever you can - some of our wives accept that and some don't. I get "the evil eye" after a couple of hours but that's OK; some is better than none. Tell her about texts or emails to/from your nude friends - get her used to the fact that you do have nudist friends. She will figure that you aren't using that to get a "friend with benefits." Well, unless you are but that's a whole 'nother topic.
Frankly, if she is dead-set against the idea of being nude in the house you have little to no hope of her ever coming around to being ok with nude outside of the house. She might "allow" you to do it without her, or she might be upset about it. You are going to have to decide which is more important at that point - freedom to be nude or your wife. We can't make that call for you but you may be forced to make it. And if giving up the freedom to be nude (at least outside with others) is going to mean giving up on your marriage then you had better proceed VERY, VERY carefully. You can't go back on that decision. My own feel is if it were ever to get to that point, I would give up on the nudity but that will be your choice to make.
Good luck to you.