I recently bought a cardigan at an estate sale with items ranging from the 50s to 80s (maybe even some newer things too?) When I first saw it, I thought it to be from the 60s because of its label design and material/fabric label. But then on the side was a small XL tag which threw me off. So then I thought maybe this is from the 70s/80s? I've attached pictures for reference. Also another question: When did S/M/L/XL first start being in use anyways? I've tried googling it but I never could find any results.