Design a vibrant t-shirt featuring a collage of traditional African patterns, celebrating the rich cultural heritage and diversity of the continent. The graphic should consist of a series of geometric shapes and tribal motifs inspired by various African cultures, arranged in a harmonious pattern. Utilize a bright and earthy color palette, including rich red (#C72C41), sunny yellow (#F6D02F), deep green (#4B8B3B), and bold black (#000000) to reflect the vibrancy of African art. The design should be centered on the chest, with the patterns extending slightly towards the sides for a dynamic effect. The final artwork must be suitable for high-detail inkjet printing to capture the intricacies of the patterns, employing layered designs with bold outlines to enhance visibility. The background should be transparent for easy printing on various t-shirt colors, maintaining the authenticity of the cultural motifs.