Roblox shirt looks stretched and blurry once uploaded

also check the file. save as png not jpg, and upload at exactly 585x559. if you work bigger and let roblox shrink it, it usually comes out softer than if you'd resized it yourself first.

probably placement. the template isn't one picture wrapped round the body, every square is a separate face of the torso or an arm, and the front of the torso is a small 128x128 box. if your logo crosses the edge of that box, half of it lands on a side face and looks stretched. the fuzziness is partly just roblox. the texture is tiny and it gets compressed, so thin lines and small text never survive. make the logo bolder and keep it well inside the front panel.