Vintage Polka Dot Zip Front Cap Sleeve Top Size M

Unique vintage top from an unknown brand (my Google translate says it is a Korean brand called “Midonis.”) White with vibrant and colorful polka dot print. Short cap sleeves. Full zip front. Cropped length. Fair condition. The seams are coming undone in multiple spots on the interior, so there are a lot of loose threads. There is some staining / discoloration near the collar. Please see last 4 pics. Unknown fabric content (fabric tag is written in Korean, I think) and missing care instructions. Size is unknown. I believe it’s a medium, but please refer to measurements below: Armpit to armpit: ~19” Length: ~15.5”