Wearing a black suit

There are a few easy ways to tell when someone is an intern. Wearing a black suit is one of them because that's all they've ever bought for their grandma's funeral. Do you want to look like an intern for the rest of your days?

if your coming into FT just buy better/proper suits. I don't think anyone will outwardly comment on it, but everyone in their head will think its a bit odd that you don't understand the etiquette.

Interns IMO can get away with it but you are seen as a kid who doesn't understand all of these (fashion) rules. 

Dark charcoal does the job.

Black suits are for funerals and for nighttime, dressy events.  Navy, Charcoal, dark grey are staples for finance

The quickest way to tell if someone is a bot is to see if they wear a black suit to an interview/job (in finance, at least). Navy and grey only, squid. 

I would think you're either a complete newbie (which I expect after your first paycheck to change it) or you're socially autistic and can't see how people dress around you. 

At best you're just disregarded as someone that doesn't know suit ettiquette/no style (which would somehow also be related to being socially autistic)

only acceptable colors are navy blue or charcoal grey, and preferably it should also fit you  

Only people allowed to wear black suits during the day are undertakers and limo drivers 

I’m with Kevin W. on this one. Better go with a dark blue suit. It looks way more fashionable. Personally, I love wearing different shades of blue.

"If you want to blend in as a full-time pro instead of looking like an eternal intern, ditch the black. Navy, charcoal, dark greythose are the everyday weapons. Black is fine for funerals, late-night galas, or pretending you have zero style awareness."

Actually, a black suit limits you a lot because you can only wear black shoes with it. Otherwise, it clashes. Your best option is a navy suit. It is much more stylish for different events and gives you many more selection options. 

As far as I know, black and gray suits are considered extremely formal. The more color you add to a suit, the more casual it becomes.

Black suits are for service staff and funerals. Basically, don’t ever wear one to work.