You will need:
double sided tape
a bow maker (Clover brand is one type you can get)
You need about 3 and a half yards of acetate ribbon. We used a ribbon that was three-quarters of an inch thick. If your bow maker doesn't come with numbers, you might want to add them. Here's a close-up of the one I used:
Take your ribbon and pass it through the center of your bow maker, shiny side down. Tape it down between the 8 and 3.
After you've wrapped all the points once, start over again at the beginning and wrap until you've gone around a total of 4 times. You will be left with a little tail of ribbon--this will become the center of your bow later!
Put a small square of cardstock on the bottom of your bow. You can add some adhesive so that the bow will stick to your gift. Go ahead and use the double-sided tape if you are going to use your bow immediately.
Staple through the center of your bow, through the hole in your bow maker.
Your bow should look something like this after you staple it.
Remove the tape you used to hold the ribbon to the bow maker and start slipping the bow carefully off the bow maker.
Start fluffing out the layers of your bow.
After you've fluffed all your layers out, your bow will look like this. Go ahead and snip the tail off of your bow.
Roll the tail of the bow into a loop and tape it with the double-sided tape. Place it in the center of your bow.