3D decorations have been used for promotional products for many years, mainly to do with 3D embroidery and 3D pvc promo items. However traditional screen printing for t-shirts can also use this technology.
The Toy Story franchise created 3D printed t-shirts with the ChromoDepth® 3D technology. The print looks like a normal 2-dimensional screen print until you put on the glasses and then the t-shirt comes alive. This technology has many applications including printing on carpet, colouring books, packaging, promo tattoos etc.
What a great way to make your message stand out.