Cut the piece of burlap ribbon and twine at the same lengths for simplicity. In the case you are making very large bows, then I would wait to cut the twine till you are ready to tie it. In terms of length, this will depend on the size of the bow you are trying to make.If you are making burlap bows for wreaths, or looking to determine how to make burlap bows for pews, then they are both about the same size as the one I made in this example and that was approximately 8 inches wide. If you looking for how to make a burlap bow for tree topper, then I would make it bigger, approximately 12-18 inches wide.After you have determined the width of the bow, then I would multiple that by three and that will be the length you are going to cut both the piece of ribbon and the twine. In this example, I cut both at 24 inches.  

Fold the ribbon in three sections.

Using the twine, wrap it twice around the middle of the three sections and tie a knot at the bottom.

Cut the twine to the length of the bow feet and viola, you have yourself a burlap bow. See, I told you it was quick and simple! Now, cover your house in these beauties!