Things You'll Need
T-shirt transfer paper
It is very difficult and time-consuming to make a Ghostbusters costume that is completely true to the movie. If you don't have the time and budget for it, you can still make one with a comparably easy design. It's good enough to appeal to movie fans but easy enough to complete in just a couple of hours.
Get a tan or off-white jumpsuit in a thrift store.
Create a name tag. You can use one of the original ghost buster names, or your own name. For authenticity, use red letters on a black background.
Print out the Ghostbusters logo and name tag on T-shirt transfer paper. Look at a picture from the movie to make sure you have them about the right size.
Carefully cut out the Ghostbuster logo and name tag, and iron them onto the jumpsuit. The logo should go on the arm, in front of and slightly below the right shoulder. The name tag should go on the left side of the chest.
Add elbow pads and a white belt to the costume.
Build a proton pack. Many materials will work; for example, you can use a cardboard box, a large piece of foam block, or a rectangular wastepaper basket. Make sure that it is rectangular, roughly the size of a backpack, and black. Add black paint as necessary.
Add straps to your proton pack. Cut the shoulder straps off of a backpack and duct tape them to the proton pack so that it fits comfortably on your back.
Make a proton wand. Find a space rifle at a thrift store or toy store and paint it black. Although this approach will not be completely accurate to the movie, it will look pretty good and take a lot less time than making one from scratch.
Make a proton pack cord. Attach a vacuum hose from the top of the proton pack to the back of the gun with duct tape. Paint over it in black.