That's really pretty,and sexy too.It would be perfect for daytime or evenings.You could pair it off with a shrug,bolero jacket,or lightweight cardigan,too.What about shoes?I see it with either pumps obviously,or perhaps a nice pair of black or even silver strappy sandals,especially for eves.
Its a really pretty dress... and I like halters a lot, I think halters look great on anyone. I personally couldn't wear it though cause of the floral pattern... I have a very small top and a really big butt, and that floral pattern with big flowers would make my butt look even bigger.
If you are upper/lower body proportionate then I think it would look great, and would work even better I think if you are bigger on top than on the bottom.