Calf-length, fitted, sleeveless dress in a textured knit with a crocheted look. 

 Narrow, adjustable shoulder straps and a V-neckline with a keyhole opening at the front. Gently frilled hem.

Bloggers Favourite, sold out from H&M

Tag size L suggested by H&M for UK 16-18, might also fit size 14 as it's very stretchy / adjustable