DubiousTeeDesigns has a variety of designs that can be printed on t-shirts and more for purchase.
SAPTK student rank shirts can be found here with links for ordering. These shirts are designed for San Antonio Pekiti-Tirsia Kali students.
Kali Combatives has a variety of designs related to PTK-SMF, Pekiti-Tirsia Kali, and the Filipino Martial Arts that can be printed on t-shirts and more for purchase.
On this page you will find various kinds of tactical gear and training equipment that I have tested, use, and recommend.