I believe this knit top dates to the 1930s or 1940s, but I'm not 100% sure (I've seen this type of variegated knit in multiple 1930s knit garments, but metallic knit fibers are more common 1940s and later). It's still an amazing piece with puffed sleeves, in maroon and purple with gold throughout and gold knit waistband and cuffs.
Size: medium to xl through bust/waist, but check sleeve cuff circumference measurement because this measurement is smaller, so probably better for the smaller end of the size range
Shoulder: 16.5 from seam to seam (and there's stretch to this measurement)
Sleeve cuff (this is the smallest measurement): max is 11" circumference approximately 10.5-11" from shoulder seam