So I just got my dress (custom made by a seamstress), and I LOVE IT.

But there's one big issue... the dress itself actually has a plain strapless sweetheart top. I'm wearing a lace button-back bolero over it for the ceremony and at least part of the reception.
The dress fits in the abdomen part really tight, but literally just the boob part just flops down like crazy. So much so that I didn't show you guys a picture of the dress without the lace top because it just would've been vulgar, haha.
It's weird because in some way, I feel like the top is too loose; but at the same time, I feel like my boobs are too big and falling out. The lace top helps to hold them in place a little (so they're not drooping too much in the photo), but without the lace top, it's ridiculous.
So here's my 1st question: Will adding little spaghetti straps hold them up? The top has a lot of structure, and even has an internal elastic bra clasp, but the boobs are still just flopping down. I actually like the look of little spaghetti straps, but not sure if it's really going to solve the problem.
2nd question: I've decided I only want to wear my engagement ring and earrings. Any suggestions for earrings?
3rd question: I'm considering a simple satin sash. I thought it might help to break up the two laces (the top and the skirt), and to visually cinch my waist a bit. Something simple, like ivory or maybe even a light blush to match my shoes. Thoughts?
Thanks for all the help!