I attend the massive majority of my social & professional occasions suited, but only wear a tie for weddings, funerals, or black-tie. Unfortunately not only do many people not realize how important it is to dress correctly for a specific occasion, they have no idea how to dress correctly. It someone's going to wear a suit it has to be done correctly or they not only look ridiculous, but frequently cause offence to others.
Some examples which have made me shake my head in dismay include: mismatching belt & shoes, belt instead of braces with a waistcoat, matching handkerchief with shirt &/or tie (the only acceptable match is white), 'comedy' ties, but worst of all, without any exception is
A suit jacket with jeans! This is like seeing a four year old pretending to dress up like an adult. It would be funny if it wasn't so sad. I can almost understand it in the country because not everyone has tweeds, but for an adult in town it's a sad joke. It just occurred to me, it's even sadder than Don Johnson in Miami Vice in the '80s - at least he got paid to dress like that.