Fashion

 Okay, so indeed, people would, as a default wear what looks like exercise or scuba suits that are fom fitting, some leaving sleaveless openings, especially if they have fur, scales, or lithodermic skin because it might not be fully comfortable even if it's customized. However, in terms of modesty of decorum we do see some other elements: Robes: Probably the most common, they're extemely simple, and yes, those who might be self concious about their mutations might effect something that makes them look like a monk or nun. Smoking jackets might make sometjing a comeback, and it's not uncommon where an entire grocery store looks like Jeff Lebwoski. Tracksuits/Athleisure: Very common, for those who don't want people staring at their butts or stomachs, but don't want to seem uptight Bandhgala: The closed color minamalist suit to show that someone is "all business". Big with memorial services, populist leftists, and business leaders who want to seem non-descreipt. Chitons and the Exomis: This is the middle ground between being super serious, usually the equivalent to smart or business casual or a flashy tux. Think Jeff Bridges in Tron, and hey, Jeff Bridges is starting to look surprisingly represented here. Accessories: T-Shirts and Jerseys: Probably the biggest vestige of consumer churn. They're easy to make, even on demand, easy to store, both fun and practical, can be used as rags, so you'll see them around all the time. Whether or not they're "modest" depends, since some women wear them intentionally tiny or the over the soulder look. Armor: Worn by security and military, something affected by people who want to appear tough, like your biker equivalents or those guys who wear military fatigues whether or not they're in the military Gilets: Usually worn for padding and item storage. Capes: Actually not common. They're incedibly impractical and some people want to mitgate the "We live in a comic book" reality if they want to seem solem or intellectual. Again, the Greco-Roman appropriation comes into play, your Himation or Chlamys. (Some mixed with the more minmalist Bandhgala, those folks have some interesting politics) as well as the "arm cape" seen by Storm and Banshee. Subcultures: Obviously music, politics, and hobbies might create all new styles of dress it's hard to ancitipate without making it an actual specific piece of lore building. But Hip Hop for instance is a great weather vane, think Ancient Egypt or how Megan Thee Stallion likes co drawn inspiration from Anime, Comics, and Video games. (Actually, this is nothing new, Elvis generally dressed like a cross between Captain Marvel and a Cowboy) So basically we might expect music afficinados, particularly attractive women, to look the most comic booky. Gang members are also likely, but keep in mind gang violence might be strongly discouraged in arcologies. If you have a prominent physical mutation, the general sense is to downplay it with extremely minamalist and obsfucating apparel, or completely own it: if you're shiny your clothes are shiny, if you have scaled you evoke snake imagery, and a tendency to not have a middle ground.