To become a fashion designer, you need to have a creative mind and a passion for fashion. You also need to have knowledge of industry trends, materials and fabrics, sewing techniques, and garment construction. Here are some steps to become a fashion designer:

1. Education: You can pursue a degree in fashion design or a related field. Some of the courses you may take include fashion sketching, pattern making, textile design, and fashion history.

2. Gain experience: You can gain experience by interning with a fashion designer or working in a fashion-related job. This will help you learn about the industry and build your portfolio.

3. Build your portfolio: Your portfolio should showcase your best work and demonstrate your skills and creativity. It should include sketches, illustrations, and photographs of your designs.

4. Develop your skills: You need to have good communication skills, be able to work under pressure, and have an eye for detail. You also need to be proficient in using design software such as Adobe Illustrator and Photoshop.

5. Network: Attend fashion shows, events, and conferences to meet other designers and industry professionals. This will help you build connections and learn about new trends and opportunities.

As for the products, materials, and ingredients used in fashion design, it depends on the designer and the type of clothing or accessory they are creating. Fashion designers try out various fabrics and produce a prototype, often with less expensive material than will be used in the final product. They also write specifications such as color schemes, construction, material types, and accessory details. The end product can be sold at different price points, depending on the materials used and the target market.