Did you ever tried on clothes you like in a shop then discover the size doesn't fit you at all? You are not that fat but you have to try on an XL or XXL? Whatever you try on, it's too long or too short? Well, personally I hate this and it's enough for me to get out of the shop and never buy from this brand again!
You're already overwhelmed by all you have to achieve when you're building you fashion ID, build your brand, create your very first collections. Why should you bother about design protection? Why not just let go?
(picture by Josefa nDiaz on Unsplash.com). Illustrator and fashion designer are two very different jobs. Spending lots of time to draw amazing illustrations of your garments could even dangerous for your deadlines.