Honestly you should really just not wear this dress. But if you're determined, I think a short cap sleeve top, possibly with bib type collar. It doesn't necessarily need to be white or all white. I think if you're going to wear this dress you really need
@Melissa Clark - Perhaps I should donate this dress to my local charity and go with a more traditional dress .... thank you for the constructive advice.
I think it looks too bulky at the top with the buttons, straps, and all of that loose long-sleeved fabric stuffed into it. A slimmer fit short-sleeved shirt would look better.