I have two dark blue suits and one charcoal grey suit (and a brown suit, but I last wore that on Objects Grand Slam in a Day birthday ride, so lets discount that one).
A black bag will go with all of these, a brown bag would look wrong with the charcoal grey suit.
Black bag for the week, brown for the weekend.
Or get a job where you can turn up in jeans.
Black bag for the week, brown for the weekend.
Or get a job where you can turn up in jeans.