Why did Henri Matisse paint a self portrait of himself in a stripped t-shirt?

Henri Matisse painted his self-portrait in a striped t-shirt to convey a sense of casualness and intimacy, reflecting his personality and artistic identity. The stripes, often associated with the working class and artists, symbolize authenticity and a connection to his roots. Additionally, the simplicity of the attire allows viewers to focus on his expression and the act of painting itself, emphasizing the importance of self-exploration in his work.