Does wearing a plain t-shirt truly help a cause? I think it is possible, particularly in terms of improving mental health awareness. Mental Health Matters T Shirt. A “mental health matters” t-shirt is more than just a style choice. It is a strong sign of togetherness and support. It shows that you care about other people’s health and want to talk about this important issue. Wearing such clothes indicates your support for mental health awareness. It helps to lessen the stigma around it.