Sure, here is an online description for a knitted overalls for girls with the specifications you provided:

Product Description

These knitted overalls are perfect for summer. The sleeveless design is cool and comfortable, and the solid color makes them a versatile wardrobe staple. Made from 100% cotton, these overalls are soft, breathable, and durable. They are also machine-washable, making them easy to care for.

Features:

• Sleeveless design
• Solid color
• 100% Cotton
• Machine-washable
• Fits true to size
• O-neck

Benefits:

• Comfortable and stylish
• Breathable and durable
• Easy to care for
• Perfect for summer
• Versatile wardrobe staple

Who is this product for?

These overalls are perfect for girls of all ages. They are a great choice for everyday wear, as well as for special occasions.

How to care for this product:

To care for these overalls, simply machine-wash them in cold water on the gentle cycle. Tumble dry on low heat or hang to dry.