This is the most useful book for becoming familiar with fabrics!
Fabric for Fashion: The Swatch Book, 2nd Ed.
super informative for learning about fashion design, I just love this book
Fashion Design Course: Principles, Practice
If you feel a lot of pressure to be creative (in any creative industry, not just fashion) this book might help! I read this last year and enjoyed a lot of Pressfield's perspectives
The War of Art: Break Through the Blocks and Win
fantastic book for people who are interested in learning more about sustainable fashion design. I bought this initially to help with a project and I'm super glad I did!