I've been wearing a wonderful brown tweed jacket and matching brown bell pants for months now, and I am often frustrated by either a) a lack of brown versions of clothes that I could combine with my current outfit or use to swap out bits, or b) the existence of brown versions that are wonderful but are in a different shade of brown that clashes badly with what I already have.
Examples:
a) The new trousers do not come in brown, but I think they'd look great with my jacket!
b) The Brown Fedora and Darcy Pigott Hat are both lighter browns than my suit, and just look wrong--but would have been great accessories to my overall look.
I do recognize that colours don't have to match perfectly for an outfit to look nice, but it does bother me when colours are close but different enough to be easily seen as different. (This happens in real life, too!)