Instant purchase is okay. I wore this during the entrance exam season. It wasn't that cold, and it was perfect for moving around without a jacket. The arm parts don't have a shirt, just the knit material. Please note: The collar is a little dirty. (Please check the photos) This is a used item, so please consider purchasing if you understand that. Even if you are in the middle of a conversation in the comments section, the person who purchases the item will be given priority. Thank you for your understanding.