In sumo, a rikishi's treatment is entirely based on his rank. Everything, every little thing in sumo, from the possession of an akeni (ornate trunk), precedence in bathing and eating, wearing a white mawashi (loincloth) during keiko and a silk mawashi during tournaments, getting a tsukebito (personal attendant), receiving a kesho-mawashi (ceremonial apron), participating in dohyo-iri (ring entrance ceremony), getting fancy hairstyles and hakama (formal male traditional attire), being excused from chores, and a ton of other privileges are completely based on ranking. All of the above are reserved only for rikishi ranked juryo or better. The ones in the bottom of the rung (who, by the way, make up the majority of rikishi) have no such luxuries. (Note: There are currently around 800 rikishi. Just 1 out of 400 ever make it to yokozuna. The top players whose bouts are shown on TV make up only about 10% of the total number of rikishi.)
This ranking, of course, is said to be totally based on ability. The better rikishi wins continuously and gets promoted, and the weaker rikishi losses. Between them is a whole world of difference.
Needless to say, in everyday Japanese society rank takes precedence over anything else, even age. A young lawyer from the University of Tokyo obviously gets more respect and better chances for a high-level career than a middle-aged lawyer from a mediocre university. You bow lower to the chairman of Keidanren (Federation of Economic Organizations) than you would the president of a small real estate company. In sumo, one's whole lifestlye is based upon one's record in the dohyo. In Japanese society, one's whole lifestyle and the degree of respect one receives is based on gakureki (education), and this is very potent because it is based on the assumption that everyone gets an equal chance to an education. In sumo as well, everybody starts as equal, from the bottom (with the exception of gakusei-zumo [rikishi with varsity sumo background] who have excellent amateur tournament records: they are allowed a few rungs up the ladder upon entrance to the pro sumo world). Every boy who joins a sumo-beya wears the same kind of mawashi and does the chores like everyone else. Promotion is entirely based on performance in the dohyo. Japanese children, too, all get the chance to go to school, where they wear the same uniforms and do the same activities. Entrance to the best schools is based entirely on one's ability during the significant examinations.
Women of all ages can now sit on the sunakaburi (lit. sand-covered) seats right next to the ring. This was not possible before WWII. Even until now, women are strictly forbidden to step onto the ring itself. Click to enlarge photo.
It is known that the legal status of women in Japanese society underwent a revolutionary change after the war. This is also the case in sumo, where "women were forbidden to sit in the first five rows around the ring until after World War II" (Sharnoff, ibid.)
With regard to marriage, omiai (marriage through a go-between) in sumo also changed according to the changes in Japanese society. Whereupon traditionally, rikishi were expected to get married to stable owners' daughters, or to the daughters of patrons, innkeepers, restaurant owners and other families closely connected to the sumo world, this has obviously changed, and marriage is no longer arranged for convenience's sake. Today, many rikishi seem to prefer to get married to small, pretty women, regardless of background or family business. Sharnoff sums this up succintly: "Although coaches' daugthers and women connected to the water trade still account for the greatest percentage of [rikishi] wives, an ever-increasing number is comprised of 'ordinary women' " (Sharnoff, p. 176).
It does seem that the sumo world is opening up and disregarding some of its age-old traditions, as Japanese society also does the same.