Hello: as far as fashion design is concerned, there are not many things used in mathematics, and we pay attention to personal design inspiration and skill practice of fashion illustration. However, garment design involves some contents of garment pattern sewing, and garment pattern needs mathematical knowledge. Generally speaking, it is not difficult to learn clothing patterns, and students who graduated from junior high school or did not graduate can learn them completely! ! As for where to learn this, it depends on your choice! I wish you success!