Hello Ayan!

Though there are fabric paints available in the market, you need not buy them if you have acrylic colours. Acrylic as a medium uses a form of plastic and therefore after drying they are permanent. To completely attach it to the material of the jacket or jeans, take help from an adult and ask them to iron the jeans. KEEP IN MIND TO NOT DIRECTLY TOUCH THE PAINT USE A COTTON T SHIRT ON TOP OF THE FABRIC AND THEN IRON. please be careful if you choose to do this, even if you don’t , don’t worry I have acrylic paint on some of my clothes and it doesn’t budge in the wash. You are good to go! Let me know if you have any other question.