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I think I read this around 20 years ago, but I may be off on that.
It's a series about a future human society where people can go into tanks to regrow their bodies according to various commercial templates. The templates have largely replaced other types of fashion and status symbol. IIRC the protagonist is a detective of some kind who investigates unlicensed and illegal templates. There's a key plot point around some kind of illegal form (possibly giant lizards?) being found at the bottom of the Mariana Trench.