A french term: "accoutrement" would be exactly what you describe.

There is a community of people who use the term everyday carry or "EDC" to describe this very idea.

paraphernalia

all the objects needed for or connected with a particular activity. https://dictionary.cambridge.org/dictionary/english/paraphernalia

'Bits and Bobs'

I believe the original version of this idiom is "bits and bobs". It means the same as "odds and ends", which means "bits and pieces, remnants, leftovers". A "bit" was a coin (three-penny bit) and a "bob" was a shilling or twelve pence (https://www.google.com/search?client=firefox-b-d&q=define+bits+and+bobs).https://english.stackexchange.com/questions/4942/bibs-and-bobs-what-does-it-mean-and-where-does-it-come-from

Backing up a bit, “bits and bobs” does not have its own entry in the Oxford English Dictionary, but is included in a larger entry for various expressions that include “bit.” It’s lumped with “bits and pieces” (very familiar to Americans) and “bits and bats” (not so) and defined as “fragments, oddments, odds and ends; small articles, personal belongings, bric-à-brac.” The first citation is an entry in A Warwickshire Word-book, 1896, which gave a sample sentence: “Gather up your bits-and-bobs, and let me lay the tea.” https://notoneoffbritishisms.com/2018/03/23/bits-and-bobs/