I work with a reliable, high-quality print-on-demand drop shipper. Once you've placed an order they will print your design on a t-shirt. Depending on the type of apparel the production process and printing method might be different.
Most products are DTG (Direct To Garment) printed. This means the design is printed directly on the product.
All-over print products are products where the designs are printed on fabric, which then gets cut and hand-sewn into the product you ordered. These products don't have white streaks.