Yes, there is a tendency for it to look like service personnel, so you have to either make it look classier or more casual.
https://d29h7ql7qnxkqx.cloudfront.net/pix/blue_coffee2088/me... http://cdn12.lbstatic.nu/files/looks/large/2013/04/26/299690... http://image.tin247.com/vnmedia/101121161236-540-334.jpg http://i.ebayimg.com/00/s/MTI2N1g4NDM=/z/6scAAMXQ74JTWkrh/$_...
Pretty much only if it is a black vest with black pants and black tie and black or white shirt.
- Jacket - Tie - Vest
Each is a step up in formality, and should not be done without the previous, unless you're Nick Wooster, and you're not.
I'm not sure if these alleged rules you speak of are codified somewhere, but given the context of the conversation (people around me are wearing hoodies and pajamas while I'm wearing a suit), I find it hard to imagine any combination of jackets, ties, and vests being truly inappropriate...
Personally, I don't like the look or feel of a tie with no jacket, or a suit with no tie.
No, this really looks genuinely terrible. Never wear a tie without a jacket.
http://putthison.com/post/29635680290/q-and-answer-when-can-...
> The answer is pretty much “I work at a cell phone store.”
(vest without jacket is just as bad, except it's "I'm a waiter")