This is probably the simplest method. You can print the Batman logo on heat transfer paper using a regular inkjet printer. Make sure you mirror the image before printing. Once printed, cut out the logo, place it on the fabric, and use an iron to transfer the image. This method works well for ultra-thin transfers and gives a decent finish.If you have access to a vinyl cutter, you can create a very thin, precise Batman logo. Cut the logo from heat transfer vinyl and use a heat press or iron to apply it to the costume. This gives a more durable and professional look.If you’re comfortable with a bit of DIY, you can create a stencil of the Batman logo and use fabric paint. Place the stencil on the fabric, and carefully apply the paint. This can be a bit tricky, but with a steady hand, it can look great and be quite thin