Screen printing on outerwear can be difficult because the fabric can be more loosely or tightly knit, made of a variety of fabric contents, and be thicker or thinner, so it requires a differing ink deposit on the garment. Bold or distressed prints work better on outerwear, as compared to more detailed designs. Correct relative tension and mesh selection in relationship to off-contact and squeegee pressures are particularly critical in this category as compensation to the thickness of the fabric must be made. Adhesive and special hold-downs are more common with outerwear as these garments tend to move or shrink slightly, particularly after a flash.
—GraphicElephants.com