How to use: You can wear this vest jacket over a t - shirt or shirt. Just zip it up and you're ready to go out in style and stay warm. It's great for casual outings or when you're spending time with family and friends. Precautions: Make sure to check the size chart carefully before buying. Since different suppliers and brands have different size standards, this will help you get the perfect fit. Maintenance: This vest jacket is made of polyester and has a silk - like cotton filling. You can follow the general washing instructions for polyester clothing. Usually, machine - washing on a gentle cycle with mild detergent is a good option. Hang it to dry to keep its shape.