casual v. casuale
When not at work, Americans love to dress casual. Dressing up can be a pain: heels, runs in your hose, tight ties around the neck. But the word casuale in Italian refers to something coincidental that happens, maybe happening to see a colleague at the local shopping centre on Sunday when you are wearing your grungiest jeans and no make-up.
Use the Italian words sportivo or informale when translating casual.
Eng) On Fridays we can dress casual at the office.
It) Il venerdì all'ufficio si può vestire in modo sportivo.