Graphics for apparel, either company branded or for a clothing line are extremely excellent ways to promote your brand. When done correctly they can be very effective in reaching your audience and turn the people wearing them into a walking billboard for you.
What the Seller needs to start the work
1. Rough Idea or thought, to provide the first concept proofs.
2. Possibly some images to manipulate, depending on the customers needs. Example: their logo or photo
The rest can be discussed and developed via email communication as the design progresses.