As an 'oldie' I was taught brown for country, black for town!! But it depends on the shade of brown - dark brown always looks fab, but light brown ----- NEVER!!
the only horse I like in black tack is pitch black & white piebald ... Unfortunately my new piebald boy fits my brown saddle and thus ... is now also going in brown. Am getting used to it, still. Which is weird as hugely prefer brown on every other horse!
I like black tack, but have brown for my new mahogany bay chap, black for the greys and the black one - with LOADs of garish sparkly gold, silver or diamanté on all of it, naturally.
I plonked the saddle on her today, have to say I think brown suits her! Didn't get a picture though, numpty ... Now to get someone to check it fits, looks okay to me but I know eff all about fitting saddles!