Wearing a tie without a jacket never looks good. Never.
Polo shirts with a blazer almost never look good together. Also, baggy corduroy pants scream single middle-aged software engineer trying to look good.
Also, thinking about proportions more can make a world of difference.
Getting a correct RTW model to work for you can make a world of difference if you can't afford bespoke. It's a tough journey, but I think there's something out there for most people provided you take time to look.
Try to think about what works for your style/body type. Sometimes looks that work for some people look really bad on others.