Hey,
I just checked the attached put a picture on a kids honey color T-shirt file and believe on my 5 years of experienced that I can design it in a Greek manner, it will not loose their sharpness. No matter how big you make it.
*I will share the [Jpeg, Png, Pdf, Ai] File.
*I used Illustrator, Illustration and Photoshop Programs.
*High-quality work will be delivered to you in a timely manner.
Your Affectionately,
Neha!!