Wearing a tie without a vest, sweater, or jacket of some sort looks like you’re going to attend a high school prom. Check out the guy in the vest. Just one more article of clothing and he looks so much put together then the rest.
If you don’t like wearing suits or blazers then a vest is a great middle ground between suited up and douche bag.
Check out this bro. By no means is he as “dressed up” as the guys above, but without a doubt, he looks like girls actually want to be seen with him.