Alongside making your background viewable, and editable, I think a nice little limited set of cosmetics related to the Background of your choosing, specifically your Planet and Childhood, would be really cool to expand the list of “basic” human cosmetics that also reflect your Reject’s background in game.
Since there are so many different options for Childhoods and the options vary by planet, I’ve broken everything down by Childhood career groups with one Planetary exception.
Cadia Homeworld: Whiteshields Armor (https://static.wikia.nocookie.net/warhammer40k/images/2/23/CadianWhiteshield.jpg/revision/latest?cb=20120628053010)
Childhoods / Careers
Mining: Hazard Suit & Rebreather. Should be some basic, without much ornamentation, fusion of these two. Last one is a good reference. (https://europe1.discourse-cdn.com/flex013/uploads/fatshark/original/3X/4/f/4f7a3af2ee0380de34267cc020141986817692f9.jpeg) (https://www.warhammer.com/app/resources/catalog/product/920x950/99120117004_GenestealerNeophytes04.jpg?fm=webp&w=670&h=691) (https://wh40k.lexicanum.com/mediawiki/images/thumb/7/74/Drudge.jpg/512px-Drudge.jpg)
Agriculture: Typical Outdoor gear, and good sun-protection hats, though I’m sure their artists could put a small futuristic 40k looking twist on it. (https://media.npr.org/assets/img/2023/05/26/honest-work-meme-cb0f0fb2227fb84b77b3c9a851ac09b095ab74d8-s1100-c50.jpg) (https://encrypted-tbn2.gstatic.com/shopping?q=tbn:ANd9GcTuTyjTzQf3mTCYpN5gTYS5otqsfDUr4lYy_lk0AeITbfftVhAxuIrhac26gSvHSBBe5m9iGbLvmdKGbFuGcBIxzcKc16E-fFBI3rv-8EEL&usqp=CAE)
Factorum: Actually found some cool concept art for this background. (https://images.dakkadakka.com/s/i/gallery/img/2014/5/8/610909.jpg)(https://images.dakkadakka.com/s/i/gallery/img/2014/5/8/610908.jpg)
Scribe: Nice artwork of a recordkeeper’s bionic eye and robes. Maybe potential tabulator backpack? (https://wh40k-de.lexicanum.com/mediawiki/images/thumb/6/69/Administratumsadept.png/300px-Administratumsadept.png) (https://static.wikia.nocookie.net/warhammer40k/images/9/9f/Ordinate-Major_Mordechai_Lorik.jpg/revision/latest?cb=20120712014026)
Militia Lackey: Some basic PDF flak vest that could look in rough condition as a hand-me-down. Good way to get flak armor on every class.
Hive Juve: Ganger and Scavvie styled gear. I like the Orlock look as a good base to modify. (https://wh40k.lexicanum.com/mediawiki/images/thumb/b/b3/OrlockGanger.jpg/220px-OrlockGanger.jpg)
Progena: Imagining like a west point cadet uniform, toned down and 40k. Commissar-lite. (https://miro.medium.com/v2/resize:fit:800/0*dS-6GjmbffgApNOK.jpg)
Moebian Shrineguard: On worlds controlled by the Ecclesiarchy, the PDF and local Frateris Militia are one and the same, and since we have 2 Shrine worlds, with 1 being a major center of an Imperial Saint, some basic suits of devoted armor wouldn’t be out of place for a better maintained Frateris force. Idk if it should be flak or more of an improvised look.