Size 10.

56 inches from the shoulder strap to the bottom hem.

39 cm pit to pit, but it's gathered and is nice and stretchy so will fit a regular size bust and a fuller sized bust too.

It's a jersey fabric (t-shirt type fabric)

BNWT.

I bought this from NEXT online last year but have never worn it.  I do not see an occasion in the near future where I'll get to wear this dress, so have decided to clear out my wardrobe.