Once the pennants are ready (whether you've cut them yourself or ordered them), thread them onto a 2 to 3 mm thick cord at regular intervals.
If you're using a small slippery cord, you'll need to tie a knot before and after each pennant so that their spacing remains fixed.
At each end, leave double the space separating the pennants and make a loop.
The garland is ready to be arranged as a decoration.
Hint! A garland of pennants can be laid "flat" over the bed, for example, but it's even prettier at an angle, with each end on a wall, as this creates shadow effects when the room is lit up.