H&M's size EUR 40 typically corresponds to a Medium (M) or a US size 10-12. In terms of measurements, EUR 40 usually has the following approximate dimensions:

Bust: 94-98 cm (37-38.5 inches)

Waist: 78-82 cm (30.5-32 inches)

Hips: 102-106 cm (40-41.5 inches)

These measurements can vary slightly depending on the specific fit and style of the dungaree dress