Captain,

A 3 mil one piece jumpsuit should work fine for the Caribbean. The really stretchy material wetsuits are quite comfortable, like the Henderson hyperstretch.

Pinnacle has a stretchy version that also is excellent.

But we'll expect a trip report and photos from your next dive excursion, and tell your Mrs. she's welcome here too!

I am editing the post because Dale was typing the same recommendation but just hit the post button a few seconds before me. I guess great minds think alike!