I tried on this style of dress from Nobody’s Child the other day, different colour, and found that it was cut in a very strange way that meant it didn’t fit. I tried a few sizes and different/no bra and it always squashed my pretty average, not big, boobs. Even in a big size.
I really like the style and wanted to buy it but am baffled as to how it would work on anyone with more than an a cup.
So advise you try it on. They have them in M&S… didn’t see that colour but you’ll know if the shape works for you.