First "Hand" the gaiter, you want the right leg gaiter in this fashion: Hold end of gaiter with the cord / leather thong loops to the outside of the leg, with the gaiter being clockwise wrapped around the calf. SO: the end of the gaiter with the holes is over the top of the looped end, clockwise.
Left leg in reverse.
Each hole should have a corresponding equal loop of cord/leather threaded through it., this needs to be approx 2" or 50mm loops. ONce the giater has overlapped, thread all four cords through the corresponsing hole.
Fold bottom loop up and thread next loop through it, folding that loop up to the hole and loop above, do all four in the same fashion, finally with the top leather strap of the gaiter going through the last loop and the being tensioned on the buckle.