Hypothetically if one had a strapless wedding dress not saying I have but if ~I did would I be better with a good strapless bra or a corset thingy the dress would hypothetically be quite unstructured so no heavy boning or support panels ... going shopping this weekend getting shoes as well so I have everything before first fitting is due
I think a lot would depend on your physique and also what you feel comfortable wearing but personally I would go for a nice basque or corset as I have found they hold up better than a strapless bra
It depends on how much you are willing to pay and whether you will wear it again. There are some really pretty (but well engineered) corsets around but they are quite expensive.
Also, the first night can make or break a marriage o the success of the sexual encounter.......not the place for amateurs. I am quite willing to give you both the benefit of my experience and considerable expertise.