I've always worn one pieces, I'm modest so I don't like showing off that much skin. I don't think it's appropriate for myself. What you wear is up to you and God in the end. If you think you would be comfortable infront of God in it, and He's okay with it. Then go for it!
I quoted you because I think you're the only one to reference this: As far as whether or not I, personally, would feel comfortable in front of Jesus/God with it.. honestly, I would feel much more comfortable in a bikini in front of God than the swimsuit Vicky posted (which, to me, is essentially a camisole/under shirt and mini-skirt - also can be said to be "immodest"). Why though? When I've worn bikinis (hah, not wearing them anytime soon, folks), it was
always either: 1. on the beach to go swimming in the ocean or 2. sunbathing (I know, I know.. hush). To me, it's context. And even though the suit Vicky posted seems modest to her, in my opinion it's just as immodest to me as a bikini is to her. Nakedness is not a sin thing. It's a temptation to us first because of the fall. It wasn't a stumbling block to Adam and Eve until after they sinned. So being in front of God close to naked would set me back to nearly that time, when God created man and woman...
naked. Besides that, I'm "naked" in front of God everyday - either literally or figuratively-speaking. And I'm okay with my Creator being able to see His creation, imperfections and all.
I also agree with Ceh and many who've said it's personal conviction and Paldasan's post (which is possibly the best post I've seen from a male on the topic).
And on a sidenote, Miami on Spring Break? Not even I would do that. Stick to your convictions, OP. And if someone wants to show off their body (someone you were going with), that is their business. If it bothers you to be around this person, you have some choices to make. But realize, it is her decision and her decision may have little to nothing to do with your convictions.