Hi Timileyin!
Your pencil and charcoal drawings are so beautiful. You are in a very cut-throat industry and competition is not merciful on average. The winning ingredient is time, building a signature, name heritage and consistency. You must be willing to go on drawing, showing up for your work and producing masterpieces in the dark, and improving on your Art and yourself.
Create a signature around your work. Something people can immediately identify as Shoremi Timileyin's work. That is where to begin. People notice difference easily. Always remember, we don't sell artworks, we appreciate artworks and when proper value is placed on that, it will sell itself.

All the suggestions mentioned by others are valuable and should be considered. In addition, build in a cost per wear duration into each product and know when to sell it off in a second-life market or yard sale after repetitive rental or even donate them to a charity. Also consider upcycling the products to extend the shelf-life and that can lead to extensive value and a separate business. The focus should not be entirely on preventing damage, but how to fully maximise the lifecycle of each clothing item even if it gets damaged. Some things with repetitive use are inevitable and with rental or fashion/clothing really for instance, it is already a variable largely outside of your control.

Wish you all the very best with your business.
Excited for you about all the possibilities!