How to use: This blazer can be worn over a simple T - shirt for a casual look or paired with a dress shirt and tie for a more formal occasion. Just slip it on like any other jacket and adjust it to fit comfortably. Attention: Always check the size chart before purchasing to ensure a proper fit. Different suppliers may have variations in sizing. Maintenance: Since it's made of polyester, it's usually easy to care for. You can machine - wash it on a gentle cycle with cold water. Use a mild detergent and avoid using bleach. After washing, hang it to dry to keep its shape. If it gets wrinkled, you can iron it on a low - heat setting.