Free Vector for CAD: Adobe Illustrator
Maybe this is just for apparel students, or students who want to learn how to create technical flats for their Fashion design portfolio pages – either way- vecteezy.com has really cool brushes that I have been tinking around with. ( I am not associated with this site). If you do not know what a technical flat is, here is one that I made recently for a technical packet.
Here is the link to free brushes that I used that were extremely useful from Vecteezy.com: