Fashion design is obviously critical. However, the fashion industry no longer has to only worry about designing clothes, footwear, accessories, etc. Designing websites & marketing materials are important aspects as well.
Adobe Illustrator is a vector graphics editor and design program developed and marketed by Adobe Inc. Originally designed for the Apple Macintosh, development of Adobe Illustrator began in 1985. Along with Creative Cloud (Adobe's shift to monthly or annual subscription service delivered over the Internet), Illustrator CC was released. A sidebar that appears at the left of the screen with a variety of tools to select, create, and manipulate objects or artworks in Illustrator. These tools can be selected as following: drawing, typing, painting, reshaping, slicing and cutting, symbolism, moving and zooming, and graph.
Adobe Photoshop is a raster graphics editor developed and published by Adobe Inc. for Windows and macOS. Photoshop can edit and compose raster images in multiple layers and supports masks, alpha compositing and several color models including RGB, CMYK, CIELAB, spot color, and duotone.
Canva Canva is an online design and publishing tool with a mission to empower everyone in the world to design anything and publish anywhere. Canva is an Australian graphic design platform that is used to create social media graphics, presentations, posters, documents and other visual content. Good tool for fashion marketing activities.
You may also want to learn about vector conversion.