Acclimatise
If it's an option, perhaps try to acclimatise by going to a clothed beach first. Thong + small bikini top is now totally acceptable, so your wife can get used to the couple seeing her nearly naked, maybe even topless, then the final step will be much easier.
Your wife may also be concerned about pubic hair styles. It's a bit more risky but you could discreetly mention this to the husband to find out the other couple's style so she (and you) have the option to 'match' if you want to.
For yourself, go to a gym / pool where you can be naked in the changing room to get used to being around other guys naked (although in your case it sounds like you've already done more than this, how do you know he's bigger?)
Please feed back on how it goes!
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