Vintage rainbow butterfly navy blue sweater

Vintage rainbow butterfly navy blue sweater. Brand is SHIRLEE and marked a size medium in women's. I'd say it's more of a petite medium. Very fitted. I think it's the sleeves that make it more fitted. Super cute! 65% polyester, 35% cotton material. Flaw: rainbow is undone at yellow part as shown (although I did think that added to it) and there is a lot of pillage throughout! Some knicks through the embroidery and a small light stain on sleeve. Shown in photos. Measures 20.5 inches pit to pit (41 inches) and it is 21 inches long. Sleeves are 18 inches long. Used item, has been washed.