My husband bought this for me but it was too big.
I'm normally fit size 10UK but for Monsoon, I only fit size 8. So this should fit for the ones with size 12 normally.
Currently selling at SGD200 in Metro Paragon, I'm letting go at 120.

For picture please view here:
Monsoon Womens Isabel Feather Dress Size 4 Purple at Amazon Women

Note: The actual color is darker purple than the picture.