u/Brilliant_Act4153

What are theese sleeve things? What are they for? Why are they always plaid? Why does google refuse to answer me? Help 🥺

Edit: thank you everyone!!! I had seen them in marry my husband and thought the old weird manager guy was just wearing a layered shirt and making terrible fashion choices. But as soon as i saw them in wonderfools i desperately needed to know what was going on lmao. I just started watching kdramas a few months ago. So wasnt sure what was going on lol