FCUK long black dress with deep cuts, Size 4 (UK)

Super elegant cocktail dress from French Connection in size 8 (UK). The dress is very floaty. Ankle-length. Bought in the UK. Dress is never worn but without tags !!! Note that the labels says size 8. This is a UK size, which transfers to US size 4 !!! I'm happy to measure exactly. Just let me know. From non-smoking house.