You can completely create your own t-shirt design if you have designing skills and experience as well as references to other models. However, designing your own t-shirt will cost you extra for the printer. Here are some ways to help you get a design for your own t-shirt:

Design on t-shirt company websites: This is really the fastest way when you just need to use a few drag-and-drop operations and choose a shirt color to have a t-shirt design right away. However, this method is very inefficient and is usually only used to make employee shirts like T-shirts and add logos. Their sales team will call you after you submit the models will be

Design your own: It probably won't cost you anything to come up with a design. However, this requires you to have design skills and an aesthetic eye to make sure that when the designs are put into practice, it doesn't make you look too weird.

Hiring freelance t-shirt designers: The freelancers in this field will provide you with designs according to your original idea or your sketches. One of the pros of this approach is that it saves you time and effort, not to mention, you will be assisted by a professional designer that can give you the most favorite t-shirt design ever.