This sounds like an elegant and practical abaya set! Here's a potential description you could use for this beautiful 3-piece set:

Elegant 3-Piece Abaya Set
This stylish and sophisticated 3-piece abaya set is a perfect blend of comfort and elegance, making it ideal for casual wear. The set includes:

• A separate slip for extra coverage and modesty, ensuring a smooth and comfortable fit.
• An open or closed abaya designed with flowing, lightweight fabric that drapes gracefully for a flattering silhouette.
• A matching hijab crafted from the same high-quality fabric, providing a seamless, coordinated look.

Made from beautiful and breathable material, this set is soft on the skin and designed to keep you comfortable throughout the day. The fabric's quality and design make it ideal for casual outings, daily wear, or even light evening events. Hand wash is recommended to preserve the longevity and luxurious feel of the fabric.