Man, I totally get why you'd want that iconic Trunks jacket design! I've scoured the internet for cool 'Dragon Ball Z' merch and fan art before, but finding a free PDF with his jacket specifically is tricky. Most official art books or costume guides aren't freely available due to copyright, but you might have luck with fan-made design templates on sites like DeviantArt or Redbubble—some creators share free vector files for cosplay purposes.
If you're looking for screencaps or manga panels to reference the jacket, the 'Dragon Ball' fandom wiki has high-quality images. Alternatively, checking out YouTube tutorials for drawing Trunks' outfit could lead you to downloadable resources. It's wild how much detail goes into that half-denim, half-Capsule Corp look!