In US clothing sizes, a size 42 typically corresponds to a men's size large or extra-large depending on the garment type, and in women's sizes, a European size 42 usually equates to a US size 10. For men's clothing, for example, a chest measurement around 42 inches would be a size large. For women's clothing, a European size 42 corresponds roughly to a US size 10, which aligns with bust, waist, and hip measurements around 94-96 cm (37-38 inches).

If you need the size 42 converted exactly for men or women or for a specific type of clothing, please let me know!