Rizz is not something one acquires. Either one has rizz or one doesn't. Those who have some rizz would understand what this word is, a word which is Oxford's 2023 Word of the Year.
I suppose it is derived from charisma by taking ris from it and jazzing it up up with two Zs. Charisma has been rizzed up in a manner of speaking. It means “style, charm or attractiveness,” or “the ability to attract a romantic or sexual partner”. Charisma does tend to attract a romantic or sexual partner. According to Oxford, Rizz was first known in 2022. However, it went viral in June courtesy of the actor Tom Holland. In an interview with Buzzfeed, he said said: “I have no rizz whatsoever. I have limited rizz.” Some nitpicking is in order here. If one has "no rizz whatsoever" one cannot have it is any measure at all, none, not even "limited rizz." But I digress.
I think charisma, if that is what rizz is indeed a shortform of, is not something you claim. It is something others accord you by various ways, including fusing up (my coinage just now for being effusive) in your presence. Charisma is not just sartorial. It is many things rolled into one where one cannot really find the beginning. In my authorized biography of the Dalai Lama (Doubleday, 2007, Dalai Lama: Man, Monk, Mystic and updated in 2019 as The Dénouement: The 14th Dalai Lama's life of persistence I wrote, "As with most seemingly gifted figures, it is perhaps futile to try to analyze or unravel or demystify the Dalai Lama. The reason they stand out in any crowd is because they have that indefinable quality. One cannot analyze charisma without simultaneously destroying that charisma."
Whether Holland has no rizz whatsoever or limited rizz is not the point. The point is it is now the word of the year 2023. That certainly gives him a great deal of rizz.