This is a striking example of a vintage Jean Muir Studio design, the diffusion label from the British designer icon, Jean Muir. This 100% wool sweater dress, is deadstock and still has the original swing tag attached to the garment, though the fashion label and fabrication label are not attached.
It is an oversize design, which would fit a UK16-18 body frame. It is unlined and would need to be hand washed.