You are referring to the cotton mawashi used for training? The juniors fold the front end of their (black) mawashi into a neat triangle which is then covered and held securely in place with the final lap of the belt.  \n\nThe sekitori have the front end of their (white) mawashi hanging down when the other end is tied at the back, and then casually loop it over and tuck it in at the front (fold the loose end over the top and just slightly insert it in, thus leaving a sort of a tunnel (if viewed from the side) in front. \n\nFor the silk mawashi they use in the tournament,  the front end is folded into a neat triangle in the same way as the juniors'. \nFor basho, the sagari(the strip of cloth with hanging spikes), is tucked in at the front before the final lap. \n\n\nI assume the link below has got what you are looking for