A degree in Fashion Design & Merchandising is typically the most common degree associated with a career in the industry. The degree itself and the process it takes to achieve a Bachelor's almost always includes numerous courses in fashion illustration as well as courses in business, merchandising, history, design, construction, and marketing.

However, are you looking to learn to draw for design or draw for art? Fashion illustration typically falls into those two groups - illustration as a foundation to create a style, garment, design, etc. or illustration for publication in magazine, print, etc. The latter seems to thrive more in the art and general design field while the former is exclusively a fashion industry focus.

If you're interested in fashion design or fashion merchandising, I suggest taking a peek at some of the degree processes sheets associated with colleges that offer that particular major. Some of the big name schools include FIT and Parson's in NY, FIDM in Los Angeles, and AIU in London, to name a few. Take a peek at their course progressions (like this one at Drexel as an example - http://www.drexel.edu/catalog/DEGREE/fash.htm) to get familiar with the scope of classes to get a degree.

If you're interested in learning to draw or illustrate more than the degree itself, there are tons of great books that can teach you how to begin illustration for fashion. Examples include Contemporary Fashion Illustration Techniques by Naoki Watanabe and The Encyclopedia of Fashion Illustration Techniques: A Comprehensive Step-by-Step Visual Guide to Fashion Design by Carol A. Nunnelly, to name a few. Search Amazon.com to get a more in-depth look at some of the books out there.

Hope all this information helps you sort through your queries regarding the pursuit of fashion. It's a great field and a fabulous industry to explore and enjoy!