Hello @Mactonight. My apologies for the late response.
Punk Jackets are part of the PvE Coin Shop. Normally, these items are not tradable. However, each month, a select few items from this shop are made tradable. You will have to wait until they are selected to be able to buy/sell them.
The tradable PvE Coin Shop items are announced in the PRO Discord server in the monthly update announcement.
Let me know if you have further questions.