@Mirabai - do you honestly think the OP would be considering this dress if she were not already confident that it would suit her?
It’s available up to a size 16 - so I’m pretty certain the people who designed and made it expect women who are not ‘very slim’ to look just as beautiful in it.
I’m really bewildered by this apparent need to tell women that they’re not good enough to wear nice clothes and should retire to a hole in the ground and hide beneath a mouldy rug …